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74 Corvette won't fast enough to start engine.

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Hey Scotty.  i really enjoy your clips!

I have a 74 Corvette 350 with a Turbo350.  I recently bought it and started cleaning it up.  I installed a stereo and amp.  The AMP would cut out after a couple min of the car running.  I realized(tested) the alternator was pushing too much voltage and that was what was killing my amp.  So, I changed the alternator.  Unfortunately, the alternator that i received was not the correct one for the car.  i didn't know that and when i tried to start the car, it would slowly crank.  I thought it was the battery.  I had that checked and the battery was good.  i even tried to jump it.  Then I thought the starter was out. I pulled it out and tested it on the ground.  It cranked.  I took it into the autoparts store and they said it was in working shape.  I also noticed that the battery cables got very hot after trying to crank it.  I also noticed that some of the wiring around the alternator were starting to smoke when I attempted to crank it.

At the time that I changed the Alternator, I also painted my intake.  I didn't pull  the intake  but I removed the carburetor, taped it up, and moved the wiring over so that they wouldn't get paint on them.  I took pictures and reconnected everything back the way it was before I first tried to start it.

I recently replaced the alternator with the correct one and changed the belts but I am getting the same problem.  I know the alternator should have nothing to do with the starter but I'm thinking my wiring got trashed because of the alternator.  Please let me know if you have any questions and I hope you have some ideas :).

 

Thank you!  Henry.

2 Answers
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It sounds to me that the starter, which might well be 48 years old, may be giving up the ghost. The fact that it cranks with no load means it's not completely dead but it may not be developing enough power to crank the engine. The contacts in the solenoid could be burned, brushes and/or commutator worn out, or there may be internal wiring problems.

The problem could also be caused by corrosion in old battery cables. The fact that the cables get hot while cranking is an indication this may be the case.

Another frequent cause of problems on old vehicles is the ground strap between the chassis and engine, as well as other grounds. All of the wiring in a car that's approaching a half century old has to be considered suspect.

Thank you. I'll pull/replace it and let you know what happens!

Henry.

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Are you sure the voltage regulator is working? Also check the cables, connectors and ground points for the starter/alternator/battery. A wirebrush and wd40 are handy supplies.

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