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86 Electrical Drain

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Old Oct 21, 2013 | 08:34 PM
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Default 86 Electrical Drain

Have a new problem that just came up. Battery was dead the other day. Checked the voltage and it was 11.8 but when I hit the key made the starter clicking and lights dimmed. Well Traced it down to something draining the battery. With no key in car, Fuses pulled for int lights. I get a 350ma draw from battery to battery wire. I have pulled all fuses and circuit breakers in the fuse panel and no change.
350 ma seem like a lot with nothing on.

Any ideas were to start..
BTW its does this after overnight.


Donnie

Last edited by dlee425; Oct 21, 2013 at 08:41 PM.
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Old Oct 21, 2013 | 09:02 PM
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Disconnect the alternator and see if the draw goes away.
First thing that came to mind, so don't get too excited.
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Old Oct 21, 2013 | 09:11 PM
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Will try that.i know it is charging but dont know if its draining. And the under hood lights are unplugged.
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Old Oct 21, 2013 | 09:15 PM
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Originally Posted by dlee425
I get a 350ma draw from battery to battery wire. I have pulled all fuses and circuit breakers in the fuse panel and no change.
http://forums.corvetteforum.com/1585232918-post5.html

Don't remember when they changed ,
your supply wires may be from the Pos starter terminal as on the earlier cars

Last edited by vetteoz; Oct 21, 2013 at 09:17 PM.
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Old Oct 21, 2013 | 09:20 PM
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Originally Posted by dlee425
Will try that.i know it is charging but dont know if its draining. And the under hood lights are unplugged.
Bad diode(s) in alternator can drain your battery
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Old Oct 22, 2013 | 12:19 AM
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Originally Posted by AGENT 86
Bad diode(s) in alternator can drain your battery
Just changed my 2 year old alternator last week due to this. It was the drain. Thank goodness for lifetime alternator. And FWIW, it tested good 4 times at the store.
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Old Oct 22, 2013 | 03:14 AM
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I've heard of an extra drain from a motor that doesn't quite shut off when it should. Possibilities are the power antenna and power seat (especially if you put the seat all the way back every time you get out of the car).
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Old Oct 22, 2013 | 08:11 AM
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Thanks, That gives me a start. I was not sure what ran off the non fused circuit.
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Old Oct 22, 2013 | 06:39 PM
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Originally Posted by vetteoz
http://forums.corvetteforum.com/1585232918-post5.html

Don't remember when they changed ,
your supply wires may be from the Pos starter terminal as on the earlier cars
Does seem to be coming from the terminal block behind the batter. I did unplug the headlight wires, wiggled the switches to the seats. If i find which red wire from the block is doing it, how can i find were it goes.
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Old Oct 22, 2013 | 09:40 PM
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Originally Posted by dlee425
Does seem to be coming from the terminal block behind the batter. I did unplug the headlight wires, wiggled the switches to the seats. If i find which red wire from the block is doing it, how can i find were it goes.
You can narrow it down by seeing what doesn't work when the circuit is found. Here is power distribution from my 86 manual.



http://members.shaw.ca/agent86/Power%20Distribution.pdf
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Old Oct 26, 2013 | 09:41 AM
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Originally Posted by AGENT 86
You can narrow it down by seeing what doesn't work when the circuit is found. Here is power distribution from my 86 manual.



http://members.shaw.ca/agent86/Power%20Distribution.pdf
I FOUND IT..

Thanks for the print. I found the problem. It was the Anti-Thief Relay. I just pulled the fuse and now it has 20 ma draw then drops close to 0.
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