Another Battery Drain Question - Team Camaro Tech
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post #1 of 16 (permalink) Old Apr 16th, 05, 04:00 PM Thread Starter
 
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Angry Another Battery Drain Question

I have a 1992 rs that was an origional 305 TBI but was converted to an '86 305 TPI, the engine is wired for the later speed density system and was professionally made. The problem Im having is that the alternator is only putting out .6 volts @ idle not sure if something is missing, the alt and battery are both new and have tested good, so Ill leave this one open to the peanut gallery
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post #2 of 16 (permalink) Old Apr 16th, 05, 04:02 PM Thread Starter
 
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Re: Another Battery Drain Question

Also forgot to mention the car is set up with all 92 sensors and accesories, including 105 amp alt.
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post #3 of 16 (permalink) Old Apr 16th, 05, 07:48 PM
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Re: Another Battery Drain Question

How in the heck can you measure .6 volts at idle? Do you mean .6volts over the battery voltage?

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post #4 of 16 (permalink) Old Apr 16th, 05, 09:17 PM Thread Starter
 
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Re: Another Battery Drain Question

I used a dvm grounded one probe and put the pos+ probe on the batt terminal on the back of the alternator
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post #5 of 16 (permalink) Old Apr 16th, 05, 09:18 PM Thread Starter
 
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Re: Another Battery Drain Question

thats all that the dvm read was .62 v @ idle (750 RPM)
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post #6 of 16 (permalink) Old Apr 16th, 05, 10:07 PM
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Re: Another Battery Drain Question

Sounds to me like the alternator isn't grounded and you are measuring the voltage drop of the diode tree. What is the voltage reading between the alternator shell and the block or shell and negative battery post?

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post #7 of 16 (permalink) Old Apr 21st, 05, 09:20 PM Thread Starter
 
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Re: Another Battery Drain Question

0 Volts
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post #8 of 16 (permalink) Old Apr 22nd, 05, 08:23 AM
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Re: Another Battery Drain Question

Try another DVM or voltmeter. It could be the meter is struck on a certain range and only reading to the right of the decimal point.

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post #9 of 16 (permalink) Old May 4th, 05, 09:10 AM Thread Starter
 
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Re: Another Battery Drain Question

I have found out that the people who built my wiring harness forgot a wire on the alternator (the one that goes on the "L" terminal) not quite sure how to run it
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post #10 of 16 (permalink) Old May 17th, 05, 08:25 PM Thread Starter
 
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Re: Another Battery Drain Question

negative cable to shell is reading 12.6v, im not sure the alt is exciting properly? But I had the Alt and battery tested today and they both were good.
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post #11 of 16 (permalink) Old May 17th, 05, 10:11 PM
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Re: Another Battery Drain Question

Quote:
Originally Posted by Purplehaze92
negative cable to shell is reading 12.6v, im not sure the alt is exciting properly? But I had the Alt and battery tested today and they both were good.
Sounds like you just confirmed the alternator is not grounded properly. Negative cable to the alternator shell should read nearly zero volts except under severe charge or discharge. Even then your reading should be in the milivolts.

Dave
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post #12 of 16 (permalink) Old May 18th, 05, 10:52 AM Thread Starter
 
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Re: Another Battery Drain Question

what would be the best way to ground it? by the way where bouts in austin are you?
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post #13 of 16 (permalink) Old May 18th, 05, 08:31 PM Thread Starter
 
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Re: Another Battery Drain Question

ok, well I connected a ground wire to one of the housing bolts and got a good ground to the alt, but still nothing
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post #14 of 16 (permalink) Old May 19th, 05, 11:09 PM
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Re: Another Battery Drain Question

You're on the trail. That measurement you took between the shell and negative cable encompassed an open circuit in the ground. Start moving the probes closer together in the ground circuit until you isolate the open.

I'm in SW austin near Loop 1 and Wm Canon if you know where that is.

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post #15 of 16 (permalink) Old May 21st, 05, 09:11 PM Thread Starter
 
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Re: Another Battery Drain Question

Giterdone, Got it fixed today, it was the wire that connects to the batt terminal, I ran a Bypass wire directly from the battery to the batt terminal and she is puttijn out 14.56 volts, and now that its warmin up I can finally drive her! Thank you all
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