66 Caprice: Battery drainage - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

 
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post #1 of 7 (permalink) Old 04-25-2014, 06:03 PM Thread Starter
 
 
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66 Caprice: Battery drainage

I have an issue where my battery is being drained. I have replaced the alternator, the voltage regulator, battery. I can not determine what's killing my battery. Any ideas?
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post #2 of 7 (permalink) Old 04-25-2014, 06:35 PM
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Welcome to the Team!

You have a short somewhere in your wiring. You cam measure the amount (in amps) at the battery with a meter which will allow you to calculate how long it will take to drain the battery flat knowing the Amp/hour rating of the battery. Something is completing a circuit somewhere in the car. It could be due to corrosion or burnt points on a contact in some switch that is allowing current to flow when it shouldn't be.

Your options are a battery disconnect switch or to replace the wiring and switches (the easy way out). Or you can attempt to trace the source of the short by starting at the ignition switch (by measuring the Ohms the switch offers to Voltage), then pulling all of the fuses one by one to isolate the bad electrical circuit. Once you know the circuit with the short you pull every inch of wire looking for a bare wire or evidence of corrosion (a green trace of copper oxide) at a point of termination that could be bleeding off power.

Big Dave
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post #3 of 7 (permalink) Old 04-26-2014, 06:59 AM
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Lights

Also check for simple drains, maybe a bad adjustment on the interior door jam light switch not allowing interior lights to go off, check same and harder to find if you have a trunk light, same for a hood light if you have one. Check also console lights if applicable and glove box light.

Paul

Paul

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post #4 of 7 (permalink) Old 04-26-2014, 09:05 AM
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Aftermarket radio's are bad for that also.
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post #5 of 7 (permalink) Old 04-26-2014, 10:04 AM Thread Starter
 
 
Join Date: Apr 2014
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Thanks Big Dave! I believe I will start with the ignition switch. I initially swapped it out with a 65 impala switch. I also had to rewire it as well. Do you have a pic or 'color coded' diagram of the ignition switch wiring? I'm pretty sure I got it wired correctlly but I am sceptical of the gauge of the wiring I used.
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post #6 of 7 (permalink) Old 04-26-2014, 10:11 AM Thread Starter
 
 
Join Date: Apr 2014
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Paul, I did replace my rear lamp harness. Everything appears to be connected. The console, hood, trunk and glove box lamps are all disconnected right now.
Thanks for the suggestions.
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post #7 of 7 (permalink) Old 04-26-2014, 10:38 PM
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With the positive cable removed, put a test light between the cable and the positive battery post. See if it lights up. If so-

Remove fuses one at a time as suggested to see if the draw goes away.

If not, then try unplugging the connector on the back of the ignition switch. Maybe somehow you got something wired up wrong on that connector?
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alternator, battery, drain, voltage regulator

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