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5/7/12 8:51pm - Original Message: 'bout had it with parasitic drain!!'
chronos51
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Phoenix, AZ - USA

Vette(s):
1982 corvette crossfire production numer C5101985. Color is silver and claret. All original numbers match. slight mods to crossfire for better efficiancy and power balanced and added fuel pressure assembly between throttle bodies,

Joined: 6/12/2011
Posts: 139
so Ive replaced the battery, had alt rebuilt, had starter rebuilt. discontected amp still have a drain on my bat. Bat holds a charge if not hooked up to car. didnt have this issue last summer while driving it.
now i drive it and just letting it sit during the day at work the bat is dead enough so it doesnt start it.
 
rechecked all wires i had to repair, ground wire from radio was on cig lighter, bat main ground wire not grounding right, still no luck. did a light test at bat but the car destroyed the test light, it hooking it up with the doors shut windows down between ground wire and bat.
 
any thoughts as to were else to check?
 
is my ecm going out on me an pulling too much power to maintain its memory? am at a loss here and am grasping at straws.
 
 
 


|UPDATED|5/7/2012 6:51:27 PM (AZT)|/UPDATED|


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5/7/12 9:11pm - Reply: 'Re: bout had it with parasitic drain!!'
Bobbi's78 Lifetime Member
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Coatesville, PA - USA

Vette(s):
1978 Silver Anniversary Paint w/Mahogany Interior

Joined: 3/17/2007
Posts: 349
Good Luck - Chased the same type of problem, checked everything, including removing the LoJack device we found under the dash over the glove box & then gave up.  Installed a battery disconnect.  No more dead Battery Smile

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5/7/12 9:13pm - Reply: 'Re: bout had it with parasitic drain!!'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Put volt meter between pos. battery cable and battery. With a drain it should show battery voltage. No drain, no voltage. Pull 1 fuse at a time until volt meter shows zero and when that happens it will at least show you which circuit is causing the drain, that will narrow it down quite a bit.

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5/7/12 9:36pm - Reply: 'Re: bout had it with parasitic drain!!'
chronos51
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Phoenix, AZ - USA

Vette(s):
1982 corvette crossfire production numer C5101985. Color is silver and claret. All original numbers match. slight mods to crossfire for better efficiancy and power balanced and added fuel pressure assembly between throttle bodies,

Joined: 6/12/2011
Posts: 139
yea havent tried that yet.
was considering doing that this friday.
also was thinking about checking the wiper switch, read someplace that their's an over ride some where under the dash and if it was used to change the wipers it would create a drain.
i just got fed up with it and didnt even touch it sunday.
 
thanks for the imput.
 
 


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5/7/12 9:39pm - Reply: 'Re: bout had it with parasitic drain!!'
chronos51
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Phoenix, AZ - USA

Vette(s):
1982 corvette crossfire production numer C5101985. Color is silver and claret. All original numbers match. slight mods to crossfire for better efficiancy and power balanced and added fuel pressure assembly between throttle bodies,

Joined: 6/12/2011
Posts: 139
Bobbi's78 said: Good Luck - Chased the same type of problem, checked everything, including removing the LoJack device we found under the dash over the glove box & then gave up.  Installed a battery disconnect.  No more dead Battery Smile



so disconnecting the bat wont harm the ecm? losing memory and having to reset itself frequently wont mess it up? on my 82?

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5/7/12 10:04pm - Reply: 'Re: bout had it with parasitic drain!!'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Using a dis-connect should not harm the ECM. I was gunna suggest disconnecting the ECM to see if that was causing the drain.
Be careful installing a meter(or your test light) between the batt and the cable....if the draw is very high, you can ruin your meter quickly. You need a meter with a high-amp setting, and protection. Most multimeters will handle around 10 amps, I think..some less than that. I would definitely use a jumper with an inline fuse on the meter end....

My '74 don't have any electronic crap on it...and it will drain the battery in a few days if not disconnected...most of these old cars will.


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5/7/12 10:16pm - Reply: 'Re: bout had it with parasitic drain!!'
Dejablu Lifetime Member
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Wichita, KS - USA

Vette(s):
2005 Daytona Sunset Orange Coupe ----------- Sold 1974 T-top, 4 spd to BillKS

Joined: 11/10/2003
Posts: 6834

Like a lot of other older vette owners, I also use a battery disconnect whenever I shut it down.  It's such a habit that I even disconnect it when I park for a short time.  I troubleshot it and went thru 2 batteries before I finally figured out to just disconnect it. Angry  I guess it's just one of the prices we have to pay.  Cry

Larry


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5/7/12 10:22pm - Reply: 'Re: bout had it with parasitic drain!!'
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
I once had a drain on my 81.  Disconnecting the ECM will not do any harm to it.  My drain was caused by a bad diode in the alternator!!  I am not saying that is your problem but y0u have something that is pulling voltage.  P.M. me your email address, I have have some info that could help!!
 
Dan


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5/8/12 5:16am - Reply: 'Re: bout had it with parasitic drain!!'
crossfire1982
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Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
Posts: 1094
I installed a battery disconnect on my 82 several years back.  I use it when parking the car at night or for extended periods.  I have seen no ill effects on the ecm at all.   In addition to helping with the battery drain problem it will decrease the fire danger in 30 year old wiring. 

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5/8/12 9:04am - Reply: 'Re: bout had it with parasitic drain!!'
Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
Depending on what year your car is, it may have a courtesy light module.  After enough time they tend to go bad and drain your battery.  I had that problem with the '78 I used to own.  Early '78s have them mounted by the fusebox.  Late '78s and following cars had them behind the glove box.  It's a flat orange connector.

When I had my '78 the battery kept running down.  One night I happened to notice the interior lights on in the car...the module was sometimes not turning the lights off after twenty seconds as designed or turning on and staying on at odd times.  I replced the module...no more problems.


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5/8/12 10:51am - Reply: 'Re: bout had it with parasitic drain!!'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Bruce, it's an '82....you bring up a good point, too. I don't think anyone had mentioned that before.

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Joel Adams
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5/8/12 5:36pm - Reply: 'Re: bout had it with parasitic drain!!'
TargaBlue72 Lifetime Member
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Lodi, WI - USA

Vette(s):
1972 Targa Blue, T-Top, Saddle leather, 350 auto,numbers match, all original except '69 factory side exhaust. Previously owned: 1969 427, 390hp, 4sp, Riverside Gold coupe, factory side exhaust

Joined: 9/25/2007
Posts: 326
Many years ago I had a drain in my 72.  Couldn't leave it sit for more than 5 or 6 days and the battery would go dead.Unhappy  So I just installed battery disconnect and lived with it.Approve

About two years ago I installed HEI distributor (with a gear tach drive) and....OLAH.....the battery drain is gone!!Smile  Guess I solved the problem without realizing it.  Now it can sit for 30 days or more and starts right up.

Just saying.

Dean






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5/8/12 8:37pm - Reply: 'Re: bout had it with parasitic drain!!'
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
That light module could very well be the problem!!!   Nah, it can't be that simple!!!  Maybe??
Dan


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5/10/12 8:39pm - Reply: 'Re: bout had it with parasitic drain!!'
chronos51
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Phoenix, AZ - USA

Vette(s):
1982 corvette crossfire production numer C5101985. Color is silver and claret. All original numbers match. slight mods to crossfire for better efficiancy and power balanced and added fuel pressure assembly between throttle bodies,

Joined: 6/12/2011
Posts: 139
Gunslinger said: Depending on what year your car is, it may have a courtesy light module.  After enough time they tend to go bad and drain your battery.  I had that problem with the '78 I used to own.  Early '78s have them mounted by the fusebox.  Late '78s and following cars had them behind the glove box.  It's a flat orange connector.

When I had my '78 the battery kept running down.  One night I happened to notice the interior lights on in the car...the module was sometimes not turning the lights off after twenty seconds as designed or turning on and staying on at odd times.  I replced the module...no more problems.



could very well be, the circut board is over 30 years old. I will check it as well as test the resistors and current on the board and replace them if they need replaced or just replace the board if needed.
I now have a few good leads and some really good ideas. Im also going to check the wiring on the rear courtesy light under the car for the spare tire area, I my have some bad wires after 30+ years

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5/10/12 9:53pm - Reply: 'Re: bout had it with parasitic drain!!'
Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
chronos51 said:Im also going to check the wiring on the rear courtesy light under the car for the spare tire area, I my have some bad wires after 30+ years


The spare tire light is part of the courtesy light circuit.  If it's on it's another indicator of a bad courtesy light module.

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5/27/12 4:23pm - Reply: 'Re: bout had it with parasitic drain!!'
chronos51
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Phoenix, AZ - USA

Vette(s):
1982 corvette crossfire production numer C5101985. Color is silver and claret. All original numbers match. slight mods to crossfire for better efficiancy and power balanced and added fuel pressure assembly between throttle bodies,

Joined: 6/12/2011
Posts: 139
Started pulling fuses today
I am using a auto volt meter to diagnose the drain
 
I pulled the courtesy  delay unit and inspected it for issues. the circut board looks ok no burn marks or popped resistors.
 
so I started with the courtesy fuse and checked the bat. it was dropping in charge 11.89, 11.87, 11.89 and so forth within a second it dropped from 11.89 to 11.80
 
so I left the pulled fuse out and pulled the Theft fuse.... reading 11.78 and holding not dropping in charge. so ive got a short in the security system to start with after ten min i checked the charge and its dropped to 11.71
the drop isnt as fast as it was with the fuse in. I will up date this as I go.
Time to pull some more fuses until i get no drain.
 
pulled one fuse at at time, replaced fuses after checking for drain. popped the ecm fuse as well the ecm, the ecm is a reman unit Im uncertian if its the correct ecm or the upgraded 84 one. the chips are the only thing that need changed to my understanding.
 
behind passanger seat under rear compartment ( yes i went looking for spiced wires) their is a set of plug ins for what is unknown to me, one plug in had 3 wires comming off of it but only 1 of the three wires connected the others cut. the only wire remaing was a gray wire. I unplugged the pigtail and watched my amp meter go from 10.56 to 11.22 I believe this is the area I need to figure out what is what and why two of the three wires are no longer attached to pigtail. near the unit the other two wires are attached to a differant pigtail I can see where it was spliced!!!
 
marcus


|UPDATED|5/27/2012 2:23:49 PM (AZT)|/UPDATED|


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5/27/12 5:59pm - Reply: 'Re: bout had it with parasitic drain!!'
kwoody
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Tucson, AZ - USA

Vette(s):
1982 Black/Tan Leather Build Code C09E Bronze TTop CrossFire Fuel Injection L83 85 Fuel Pump Auto Axle 2.72 Firestone Firehawk Indy500

Joined: 7/11/2010
Posts: 415
Hi Marcus,

I would look at the O2 sensor.  It is a common improvement on '82s to install a heated O2 sensor. It will get the O2 signal going to the ECM soon after start so, the system gets into and stays in closed loop mode.  I have one but, have not installed it yet.  I'm looking for a switched power source and since Baby is running well, I plan to wait until the O2 sensor needs to be replaced before installing the new heated version.

It may be that your drain is there.


Just a thought. Good Luck


Keith



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5/28/12 12:47am - Reply: 'Re: bout had it with parasitic drain!!'
chronos51
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Phoenix, AZ - USA

Vette(s):
1982 corvette crossfire production numer C5101985. Color is silver and claret. All original numbers match. slight mods to crossfire for better efficiancy and power balanced and added fuel pressure assembly between throttle bodies,

Joined: 6/12/2011
Posts: 139
so I got on the Die hard battery site and looked up maint specs on my battery. my battery isnt holding a charge so Im gonna head down tuesday and have it replaced. with my bat tender on it at full charge with the battery disconected from the car compleatly the amp meter acrossed the posts shows it discharging. I think I have a bad cell in the bat. so with a new one I can start this process again

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5/28/12 8:23am - Reply: 'Re: bout had it with parasitic drain!!'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6806
My battery drain days have improved over time - I think the factory alarm was the biggest factor. I also replaced all of the grounding straps on the car and added a couple extras. Cleaned all of the mounting areas...

Car parked for a month and will turn over. In the winter I do keep her on a battery tender...

Paul


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5/28/12 9:17am - Reply: 'Re: bout had it with parasitic drain!!'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
chronos51 said: 
behind passenger seat under rear compartment ( yes i went looking for spiced wires) their is a set of plug ins for what is unknown to me, one plug in had 3 wires coming off of it but only 1 of the three wires connected the others cut. the only wire remaining was a gray wire. I unplugged the pigtail and watched my amp meter go from 10.56 to 11.22 I believe this is the area I need to figure out what is what and why two of the three wires are no longer attached to pigtail. near the unit the other two wires are attached to a different pigtail I can see where it was spliced!!!


What colors are the other wires in that connector? The only grey wires I see in the wiring diagram for the rear compartment area are for the power door locks.
Not sure on the '82s, but earlier cars had the alarm system relay back there, too, but I think the '82 had the relay under the shifter console.



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