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.

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

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

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.

yea havent tried that yet.

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

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.

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.   I guess it's just one of the prices we have to pay. 

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!!

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. 

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.