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Old December 22nd, 2011, 01:22 PM   #1
bdd1469
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96 olds ciera batttery drain.please help.

Im working on a freinds 96 ciera with a 3.1
The car is clean,unmolested,stock radio,no trailer wireing.
I put a volt meter between the positive battery cable,and the battery,it is pulling 12+ volts out of the battery,with the doors shut,lights off,key out.
I pulled every fuse in the glove box,every relay under the hood,that was easy to reach.
I unhooked the computor,the abs pump,the steering colum.I unhooked the plugs to the transmision.None of the things I tried made the voltage pull change,so Im not sure how to isolate the circuit with the problem.
I also tried unhooking the alternator,thinking it could be shorting out inside.
I appreciate any advice,I am pretty good at finding problems like this,usually,this has me stumped.thanks.
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Old December 22nd, 2011, 01:31 PM   #2
Medic8
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Ok, now this seems like a really dumb question, but this site has some really dumb people, so I'll ask.

When you connected the voltmeter to the terminal and the battery, was the terminal still connected to the battery?

Here's a better test, if your meter will do Amps. Disconnect the positive cable from the battery. Put one lead on the battery, and the other on the terminal end. Watch the reading. It might be negative, but that's fine. It'll still show the amp draw. Then, start pulling fuses again.

Usual suspects:
underhood light staying on (could be short, could be a switch)
trunk light
glove box light
defrost button stuck on
shorted cigar lighter
fuel pump relay staying on

Any number of things could be causing the draw. You were on the right track, just need to measure the amp draw differently.
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Old December 22nd, 2011, 03:48 PM   #3
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Quote:
Originally Posted by Medic8 View Post
Ok, now this seems like a really dumb question, but this site has some really dumb people, so I'll ask.

When you connected the voltmeter to the terminal and the battery, was the terminal still connected to the battery?

Here's a better test, if your meter will do Amps. Disconnect the positive cable from the battery. Put one lead on the battery, and the other on the terminal end. Watch the reading. It might be negative, but that's fine. It'll still show the amp draw. Then, start pulling fuses again.

Usual suspects:
underhood light staying on (could be short, could be a switch)
trunk light
glove box light
defrost button stuck on
shorted cigar lighter
fuel pump relay staying on

Any number of things could be causing the draw. You were on the right track, just need to measure the amp draw differently.
What he said.
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Old December 23rd, 2011, 09:28 AM   #4
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Yes my battery is unhooked. I put my meter in series between the positive battery post,and the pos batt cable.the negative cable is still hooked up.
I dont know why I was thinking I could just measure volts,it's been a while since I've had a problem I couldn't find easily.
I have my meter on the 10 amp setting,It is pulling .81 amps always.If I open the door,it goes to 2.6,shut the door it goes to 1.4,and it drops back to .82 after about 30 seconds.I think that is the curtisy light timmer,doing its thing.
I pulled every fuse,every relay again with no change in amps being pulled.
Im wondering if the starter could be shorting out inside?
I need to try unhooking the alternator again,while watching for a change in amps.
Any other suggestions?
Thanks
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Old December 24th, 2011, 05:22 PM   #5
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I narrowed the problem down.I pulled the car back in my shop,and noticed the heater motor was still running,after I pulled the key out.
To the best of my knowledge the blower motor should not have power after you shut the car off.I unhooked the steering column,thinking the ignition switch is bad.The blower motor still has power,even with the ignition switch unplugged.
I tried unplugging the alternator,thinking it could be backfeeding some how,it changed nothing.
Does anyone have a clue whats going on?
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Old December 24th, 2011, 10:32 PM   #6
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Either the heater controls are bad or someone screwed with the wiring previously. I would get a schematic of the system and start back tracing.
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Old December 24th, 2011, 10:48 PM   #7
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First I would unplug the blower motor and see if your draw is gone.then I would look at the high speed relay,heater controls,ect
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Old December 24th, 2011, 11:11 PM   #8
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Maybe a blower motor resistor?
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Old December 25th, 2011, 08:14 AM   #9
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Prolly the high blower relay stuck on.
That is the only thing in the heater fan circuit to have battery power.
Look at a wiring diagram, it can be very helpfull on these types of problems.
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Old December 25th, 2011, 09:28 AM   #10
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Quote:
Originally Posted by Ironman Offroad View Post
Prolly the high blower relay stuck on.
That is the only thing in the heater fan circuit to have battery power.
Look at a wiring diagram, it can be very helpfull on these types of problems.
I am going to a freinds house later for a wireing diagram,he has the mitchell system on one of his computors.
I tried unplugging the step down resistor,the blower motor,and the blower motor relay.
My draw goes down every time I unhook something in the heater circuit,but still has .2 amp draw with everything unhooked.
Thanks for the advice.I will post more,when I get a schematic.
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