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Oldsmobile Forum: HELP!!! I need some direction
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  #1  
Old January 13th, 2018
thorpus27 thorpus27 is offline
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HELP!!! I need some direction

i HAVE A 1987 Toronado Brougham that is eating batteries faster than I can replace them. I have changed the alternator twice in the last two months only to find battery dead after 2-3 days of not even operating vehicle. I am at a loss as to what to even look for now. This last alternator I put in was outputting 14 volts with vehicle running at completion of replacing alternator, with a brand new battery only to have a dead battery 2 days later that wont even take a charge. Can anyone give me some direction as to what to do next? Any help would be appreciated. Thanks.
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Old January 13th, 2018
Cutlass350 Cutlass350 is offline
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You have something that is drawing too much power when the engine is off.

Do you have any aftermarket stuff in the car - alarm, radio, etc?
If so, first try removing the fuses for those devices.


A sometimes quick and simple way to get an idea of the bad device, is the following:

o) Engine Off

o) Use a digital voltmeter connected to the battery.
You want to be able to see the voltmeter, while you are yanking fuses.
Use jumper cables, extra wires, etc.


o) Remove a fuse.

o) Wait 60 seconds (or more) for the battery voltage to stabilize.

o) Note final battery voltage and the fuse number.

o) Replace that fuse.

o) Repeat the above 4 steps for all of the fuses.



There will be the biggest voltage change on the circuit that takes the most current.
That will likely be the circuit with the bad device.


Also:

https://www.youtube.com/watch?v=KF1gijj03_0
How To Perform a Parasitic Draw Test
EricTheCarGuy


Good Luck!
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Old January 13th, 2018
Cutlass350 Cutlass350 is offline
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Also:

Google: parasitic current draw test

https://www.google.com/search?q=para...rent+draw+test
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Old January 13th, 2018
thorpus27 thorpus27 is offline
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Thanks for the advice...Have never heard of a parasitic draw so I gained more knowledge today. Tis a great day! Getting a new battery then start testing things. Thanks again.
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  #5  
Old January 14th, 2018
Cutlass350 Cutlass350 is offline
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If you don't have one already, I suggest that you get a Dealer Service Manual.

Do the following search on ebay:
(87,1987) Toronado service manual


It looks like they are cheap. Not much more than the shipping costs. You likely have one of the last Toronados still on the road. I know the feeling. :-)

I don't know about that car. It likely has a ECM - engine computer. I don't know when GM started using BCMs (body control module computers).
Those get power all the time. I know that BCMs do go bad.

Radios, alarms, etc, also get battery power all the time.

Also, don't forget that we're talking about a car that is older than 30 years. So, regardless of whatever went bad, that's still an impressive life in an automotive environment!

Good Luck!
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