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1/27/13 10:40am - Original Message: 'Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31
Hi everyone
new to the forum.  I just purchased a 71 C3 t-tops.
I feel like i have committed polygamy. 
this car is like a second wife. 
I am making repairs (as I guess you always will) and have replaced the door jamb switches.
I cannot get interior light to work.
if I ground one side of the fuse with a test light the lights come on.
I am guessing a bad ground somewhere.
anyone know where to find that ground???


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1/27/13 12:55pm - Reply: 'Re: Interior lights will not work'
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
Welcome to the forum!

The ground is most likely integrated into the interior harness. Best to look at a wiring diagram if you have one. If not Joel (aka Adams Apple) might be able to help you with a copy.

Just looked at my wiring diagram and it looks like the ground for the interior lamps is in the ign switch harness...

Good luck!

Paul


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1/27/13 1:09pm - Reply: 'Re: Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31

Paul

thanks for the heads up.  i am under there riight now and sorry I started to look.
Lots of cut wires, disconnected etc.
I have to get a wiring manual.
 
I grounded one side of the fuse and the llights work. 
so i figured a bad ground. 
 
Paul


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1/27/13 5:01pm - Reply: 'Re: Interior lights will not work'
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
Fiberglass cars are different from metal cars so they're wired differently by necessity. In metal cars the door jamb switches are self-grounding and opening the door completes the hot circuit. In a 'glass car the switches are grounded by a wire and are always hot and opening the door completes the ground. To make it easy, try running a ground wire from the door jamb switch direct to a metal ground so you don't have to mess with the wiring harness. It should accomplish the same thing.

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1/27/13 7:12pm - Reply: 'Re: Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31
Thanks gunslinger.
 
If i run the ground to one jamb switch will all of the lights work even the other side switch or do i have to run a ground to all. 


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1/27/13 8:36pm - Reply: 'Re: Interior lights will not work'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
I would assume that your 81 is like my 82 when it comes to the interior lights.  If the dash lights work then is looks to me that your basic ground for all interior lights is working as it seems that most go to the same grounding point.  That would mean that the bad ground wire could be where the different circuits tie together.  The ground point is 101 have no idea where that is on the car. 
 
Bottom line would be that I do not know how many separate ground wires you will have to run if only some of your inside lights are off.  If on the outside chance none of your interior lights work then it is basically the single ground point that is bad and it may be worth trying to find that point. 
 
My manual does not show the complete car wiring it only shows individual circuits so it really is hard to see.  Maybe Adam has some specific trouble shooting ideas for the system that could help.
 
 


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1/27/13 9:19pm - Reply: 'Re: Interior lights will not work'
Case75
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Check this site:
 
 
The ground is at the right door jamb switch according to this diagram.


|UPDATED|1/27/2013 7:19:13 PM (AZT)|/UPDATED|


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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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1/27/13 10:40pm - Reply: 'Re: Interior lights will not work'
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: 19459
The door jamb switches for the interior lights are screwed into the metal of the birdcage....which provides the ground for the pin switches. The most common problem is that the tiny terminals on the pin switches will break, leaving the wire to just flop around, and not work the interior lights.
If the interior lights come on when you turn the headlight switch full counterclockwise, then you probably have bad pin switches, as in the terminals have broken off. You can buy replacement terminals and replace them yourself, or you can purchase new pin switches.
If you remove the kick panel on the driver side(or passenger side), you should be able to see the back side of the pin switch....and prolly a loose wire that goes to it.




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Joel Adams
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1/28/13 9:06pm - Reply: 'Re: Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31
thanks for the help.
yes you are correct there is one ground point.
Case75 was right on the money with the wiring diagram.
Great !!!
I am able to follow the wires back to the ignition switch.  that is where the ground goes.
I will get back in there and follow that.
thanks again
Paul


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1/28/13 9:12pm - Reply: 'Re: Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31
Adams Apple;
i pulled both kick panels and replaced both jamb switches.
the right switch only has one wire to it.
the left switch has two.
the ground from the left switch goes thru the ignition switch. 
I have to get back under the dash and check that out.
i also have a few cut wires i need to figure out.
thanks for the help.
Paul


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1/28/13 9:15pm - Reply: 'Re: Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31
the wiring diagram was great!!!
thanks,
looking at it i see only one wire on the right switch (passenger side)
two wires on the left switch.
replaced both switches and connectors
now i have to find the ground which looks like it goes to the ignition switch.
Will get it fixed and keep you posted.
thanks again.
Paul


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1/28/13 9:51pm - Reply: 'Re: Interior lights will not work'
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: 19459
The black wire going to the ignition switch connector goes up to the Key In Warning buzzer, on the back of the key cylinder. It will have no effect on whether or not the courtesy lights work. The buzzer sounds if you open the door with the key still in the ignition, to remind you to take your key with you. That is why that wire is only on the driver side door switch.
The switches at the rear of the door, on the "B" pillar(where the latch is) are what actually work the interior lights in the rear compartment. The front switches only operate the front courtesy lamps. I assume you have checked the fuses, right? Thumbs Up

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Joel Adams
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1/28/13 10:11pm - Reply: 'Re: Interior lights will not work'
Case75
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Adams' Apple said: The black wire going to the ignition switch connector goes up to the Key In Warning buzzer, on the back of the key cylinder. It will have no effect on whether or not the courtesy lights work. The buzzer sounds if you open the door with the key still in the ignition, to remind you to take your key with you. That is why that wire is only on the driver side door switch.
The switches at the rear of the door, on the "B" pillar(where the latch is) are what actually work the interior lights in the rear compartment. The front switches only operate the front courtesy lamps. I assume you have checked the fuses, right? Thumbs Up

Never knew that about the rear switches; thought they were just for the alarm! There's a lot on that fuse BTW; clock, cigar lighter, curtesy lights.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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1/29/13 1:21am - Reply: 'Re: Interior lights will not work'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
The Interior lts have power and are looking for a ground, the door switch is the ground when screwed into the pillar. the sw with 2 wires is providing a ground for the lts and the key buzzer the does the key left in buzzer work?
 1 wire switch is just a ground for lts
do the lts come on when the headlight sw is turn all the way counter clockwise ?
 
you can grnd the wire at the dr switches (to good ground point)
 
Hope this helps
 
 
 


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1/29/13 8:58am - Reply: 'Re: Interior lights will not work'
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: 19459
Case75 said:Never knew that about the rear switches; thought they were just for the alarm! There's a lot on that fuse BTW; clock, cigar lighter, curtesy lights.


Remember, we are discussing a '71 model here....not all of them had alarms, since it was still an option at that time. If it does happen to have an alarm, the wiring is a little different, but not much. Thumbs Up
According to the wiring diagram for the '71 w/o alarm, the rear door switches only operate the rear compartment lamps.


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Joel Adams
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4/30/13 8:42pm - Reply: 'Re: Interior lights will not work'
gagsenior
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Canadensis, PA - USA

Vette(s):
1971 White T-tops with Saddle leather interior 350/270HP with a 4 speed trans

Joined: 12/31/2012
Posts: 31
We did finally get this fixed in addition to other items that did not work.
the right jamb switch has only one wire= the left side 2. 
after removing the entire dash we found the ground wire on the left side.  it is just below the headlight switch. 
cleaned the ground and fixed the interior lights.
the original clock also started working ---- almost fell over.
It also keeps good time.
 
One problem left.  fixed a lot of wiring and found a green wire that was cut.  figured out it goes to the reverse lights.  connected everything and fixed harness to the reverse lights.  Now they stay on all of the time.
any help with that one???
 


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4/30/13 9:48pm - Reply: 'Re: Interior lights will not work'
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: 19459
Check the reverse light switch on the transmission...it may not be connected to the linkage, it may be faulty, or there may be a short in the wiring for it.

Glad you got your interior lights working!


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Joel Adams
C3VR Lifetime Member #56    
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(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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4/30/13 10:28pm - Reply: 'Re: Interior lights will not work'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 872
Adams' Apple said: Check the reverse light switch on the transmission...it may not be connected to the linkage, it may be faulty, or there may be a short in the wiring for it.

Glad you got your interior lights working!

I fixed my constantly getting out of adjustment backup light switch by removing the bulbs.  Wink



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4/30/13 10:45pm - Reply: 'Re: Interior lights will not work'
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
I installed lighted switch under dash for my back ups after repeated attempts to get new back up light switch to work properly...would either stay on all the time or off all the time. 

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6/17/13 1:26pm - Reply: 'Re: Interior lights will not work'
GoodyT
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Orlando, FL - USA

Vette(s):
1979 Yellow L-82 Auto - SOLD 1994 1992 White ZO7 6 Spd - SOLD 1998 1978 Silver Anniversary L-82 4 Spd - SOLD 2006 1979 Silver L-82 4 Spd - 18,451 miles 1 owner car, found having been in storage 20 years. Purchased in 2010.

Joined: 4/2/2005
Posts: 28
Great read, 

After fixing a bunch of mysterious wires in my Vette as discussed in other topics I have most of my electrical issues resolved.  

EXCEPT 1... My issue is my interior over head courtesy light will not turn off... any ideas? 

Thanks 




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