C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Mar 13, 2016 | 01:12 AM
  #21  
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With those results, my normal take would be that the battery is very weak and won't hold adequate charge. You can put the battery on a charger and, rather quickly, it will show a full charge with the proper voltage.

But, the CAPACITY of the battery could be very small, so that very little charge is actually built up in it. So, the engine would crank slowly, and not for long, before it goes dead again.

The quick test for this is to use jumper cables to start your car from another battery [or vehicle]. If you do this from a newer car with computers, read the Owner's Manual to be certain of how to properly 'jump' power to another vehicle.
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Old Mar 13, 2016 | 09:24 AM
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Originally Posted by 7T1vette
With those results, my normal take would be that the battery is very weak and won't hold adequate charge. You can put the battery on a charger and, rather quickly, it will show a full charge with the proper voltage.

But, the CAPACITY of the battery could be very small, so that very little charge is actually built up in it. So, the engine would crank slowly, and not for long, before it goes dead again.

The quick test for this is to use jumper cables to start your car from another battery [or vehicle]. If you do this from a newer car with computers, read the Owner's Manual to be certain of how to properly 'jump' power to another vehicle.

He's already using a "jumper box" with the same result.
Though it's possible that both his battery AND the jumper box are bad.

Last edited by Hammerhead Fred; Mar 13, 2016 at 09:24 AM.
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Old Mar 13, 2016 | 02:54 PM
  #23  
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Originally Posted by Hammerhead Fred
So, that rules out lots of troubleshooting cables/wires/etc.
Now time to rule out the starter.
You can, yank all the plugs and see if the motor spins up.
Without plugs the motor should spin very freely/fast.
If not: yank and bench test the starter.
Ok, I can try that. One thing that is holding me back is that the car is about 45 minutes away, so I only get one day a week to work on it.


While i was under the car I found this - looks like one of the starter grounds failed in the past and they had to replace it.
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Old Mar 13, 2016 | 03:49 PM
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That is NOT the starter ground. That's the ground for the wiper motor. The starter ground wire is the same size at the battery wires. We've described what it is and where it is. You have to take it from there.
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Old Mar 13, 2016 | 08:52 PM
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The starter is grounded to the block.
The block is grounded to the frame.
The frame is grounded to the battery.
You ruled all that out with he jumper cable.
That small wire is likely the ground for the blower, wiper, etc.
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Old Mar 14, 2016 | 12:09 PM
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It sounds like you should consider testing the starter.Testing the armature and field coils for insulation break down under load requires special equipment. You may want to consider taking the starter to a shop that rebuilds starters, generators and alternators to have it tested. If you can't locate one locally talk to a mechanic that works on heavy equipment and trucks.

By the way, before you go there check the brushes.

Last edited by mickey5; Mar 14, 2016 at 12:16 PM.
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