battery being drained - Team Camaro Tech
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post #1 of 14 (permalink) Old Jan 30th, 08, 07:04 PM Thread Starter
 
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battery being drained

The starter is draining the battery from 12 volts to 8 volts. What is the deal? Not having enough juice for the car to start. I have to jump it to get the car started.
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post #2 of 14 (permalink) Old Jan 30th, 08, 07:45 PM
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Steven
 
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Re: battery being drained

Based on your description, it is possibly a dead cell in your battery. You probably need to get a load test done on it.
Also, always check the quality of your connections...clean and secure.
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post #3 of 14 (permalink) Old Jan 30th, 08, 09:29 PM
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Re: battery being drained

Remove the ground lead from your battery and insert a test lamp between the battery post and cable clamp. The test lamp should not light. Make sure the dome light and other predictable things are off (door shut etc.). sdt^2 is correct also - 8 volts is mysteriously close to a battery with one dead cell.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #4 of 14 (permalink) Old Jan 30th, 08, 09:49 PM
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Re: battery being drained

The best way to test for a bad cell or similar is get a battery hydrometer..cost a cople bucks...dont take to much notice of the charge part charge levels, look for a cell(s) that is quite different from the rest...

My Spelling is not incorrect...it is creative

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post #5 of 14 (permalink) Old Jan 31st, 08, 05:51 AM Thread Starter
 
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Re: battery being drained

Took the battery to Advanced Auto to get tested. Machine said it was good. Taking it back to see if its a dead cell. Just installed a crate 400 and put all the connections back the same way that the were before. Will do the test like you guys told me to try before I drop the battery off. Thanks.
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post #6 of 14 (permalink) Old Jan 31st, 08, 06:06 AM
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Steven
 
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Re: battery being drained

As a side thought, also check your timing the next time you have the car running ... If it is advanced too far, it will make starting more difficult.

There is a possibility that you may have a starter or solenoid issue. Still, with the positive cable being connected directly to the starter, you should have full voltage on that connection. You may want to check the voltage on the crank circuit wire attached to the starter solenoid.

I was taking you initial post to mean that the voltage dropped when you attempted to start the car. If you are coming out in the morning and the battery is down to 8 or 9 volts, something else is draining it. For example, you may have a bad alternator draining it, or you may have wired something incorrectly. You just have to work through the possibilities.
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post #7 of 14 (permalink) Old Feb 1st, 08, 10:10 AM Thread Starter
 
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Re: battery being drained

Upgraded the battery. Put it in and it started up with not problem. I go to start it this morning and nothing. I hear the starter and thats it. It is not rotating the engine. I'm stumped. When I turn the key it reads 12 volts. When I start it it goes down to 8.
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post #8 of 14 (permalink) Old Feb 1st, 08, 10:45 AM
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Daral
 
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Re: battery being drained

It could be your starter. Have you had it checked?

Daral (67 RS/SS 350)
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post #9 of 14 (permalink) Old Feb 1st, 08, 05:23 PM
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Re: battery being drained

My neighbor had a fuel pump problem a few months ago. Long story short he puts some abuse on the starter trying to get it home. After it was all over with and his battery was recharged, the starter would crank, but not very well. We pulled the starter out and did a test on it. As we expected, the motor would spin up (though not as fast as it should), but when the power was removed it would stop immediately. We believe one of the magnets inside fell down against the armature. The thing stunk like the dickens so we just replaced it without getting into it to see what was wrong.

During crank, seeing your battery voltage drop to 10 volts or so is normal. When it hits 8 volts something is wrong.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #10 of 14 (permalink) Old Feb 1st, 08, 10:11 PM
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Re: battery being drained

Basic Battery alternator load check..assuming u have done a cell hydrometer check as mentioned in a previous post and all cells read about the same... and all terminals clean and tight.
idle the car, turn on everything can, wipers indiactors lights radio heater fan etc
Assuming the alternator inslalled is rated for your car accessoriies 64 up then the voltage across the battery should be over 12 to 12.5 volts
If not faulty battery but would have shown up with hydrometer, or faulty charging system
If the above is ok...
basic Starter check With a fully charged battery lights etc all turned on, turn the motor over on the starter , voltage across the battery should be about the 9.5 to 10 volts
If not... bad contacts in solenoid, poor terminal contact, dry joints in the armature, bushes stuffed, comutator (where the bushes run on the armature) needs resurfacing.

My Spelling is not incorrect...it is creative

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post #11 of 14 (permalink) Old Feb 2nd, 08, 05:57 AM Thread Starter
 
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Re: battery being drained

Thank you guys. I will be working on the car on sunday and checking all the suggested items. Have to work on the house and will be brainstorming all day. Thanks.
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post #12 of 14 (permalink) Old Feb 3rd, 08, 06:22 PM Thread Starter
 
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Re: battery being drained

Finally found the problem. Went to get the alternator checked and the guy was like its not hooked up right. It wasn't hooked up to the voltage regulator. Plugged it in the back of the alternator and its doing its job now.
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post #13 of 14 (permalink) Old Feb 4th, 08, 04:40 PM
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Re: battery being drained

Thanks for posting back David. A bunch of us are clonking ourselves now for not thinking to check. I'm sure we'll remember to recommend checking that for the next poor soul with your symptoms.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #14 of 14 (permalink) Old Feb 4th, 08, 10:05 PM Thread Starter
 
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Re: battery being drained

Not a problem. If it wasn't for your guys input and suggestions I would be still scratching my head for a bit until I found the problem. Just wanted to say thanks once again.
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