1970 chevelle only starts if I disconnect then reconnect battery - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 8 (permalink) Old Jun 26th, 18, 3:29 PM Thread Starter
 
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1970 chevelle only starts if I disconnect then reconnect battery

Hi

1970 454 ss chevelle, car was fine, then one day, when I went to start it, I just got the click from the starter solenoid a couple of times, the n it would start, but only once
we have checked the battery, battery cables, ignition switch, purple wire, voltage regulator, horn relay and starter(two of them), and yet the car will only start if 1. on a charger, or 2. if the cables are disconnected and reconnected,. and then it will start only once. What is also odd, when I turn the key, the temp gauge freaks out, needle is all over the place unless the car starts. related I do not know.


car will start in both neutral and park so it it's not the neutral safety switch, we've cleaned/checked all the grounds, and there is no alarm on the car. any thoughts what might be going on?


Thanks

Mike
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post #2 of 8 (permalink) Old Jun 26th, 18, 4:04 PM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

Starter solenoid hanging up?
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post #3 of 8 (permalink) Old Jun 26th, 18, 4:17 PM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

What is voltage when key off, key on, cranking, running.
My guess is a loose connection arcing sometimes.

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post #4 of 8 (permalink) Old Jun 26th, 18, 5:00 PM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

Sounds like shorted diode in your alternator.

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post #5 of 8 (permalink) Old Jun 27th, 18, 4:51 AM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

Some basic testing first to try & isolate the problem.
Using a screwdriver, bridge the large terminals of the solenoid. The starter should crank. If it doesn't crank, then you have a connection problem [ corroded/loose terminals etc ], battery problem, or the stater motor.

If the starter cranks ok, then the problem could be poor connections, the sol itself, ign sw, wiring etc.
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post #6 of 8 (permalink) Old Jun 27th, 18, 5:21 AM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

Check the ground at the block. Take it off clean it really good and put it back on really tight. You can try running a jumper cable from the ground terminal to the battery to the block somewhere and see if that makes a difference and starts. That would isolate the problem


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post #7 of 8 (permalink) Old Jun 28th, 18, 11:02 PM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

I would beg borrow or steal a good battery and see if that fixes it.That's why I like having a couple cars with the same battery.Pop one out of one car and try it in another.
If the battery tests out healthy check for a voltage drain thats weakening the battery by constantly drawing on the battery's available voltage.
Remember this a healthy battery should start an engine multiple times without it going dead.
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post #8 of 8 (permalink) Old Jun 29th, 18, 7:30 AM
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Re: 1970 chevelle only starts if I disconnect then reconnect battery

Quote:
Originally Posted by 71350SS View Post
I would beg borrow or steal a good battery and see if that fixes it.That's why I like having a couple cars with the same battery.Pop one out of one car and try it in another.
If the battery tests out healthy check for a voltage drain thats weakening the battery by constantly drawing on the battery's available voltage.
Remember this a healthy battery should start an engine multiple times without it going dead.
Get your battery "load tested" at an auto parts store - usually a free test. This analysis will tell you how many amps it can deliver for starting current. While a voltage measurement at the battery is an important number, it is only half of the equation. Volts x amps = watts . . . the ability to do useful work such as spinning a starter motor.

Rick

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