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HELP with my 1970 3500

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Sounds electrical. But first we need to make sure the engine turns over freely, that it's not locked up(hydrolock, etc.).

See if you can pull the spark plugs and put a wrench on the crank pulley and turn the engine over by hand. If not stop and pull the engine, If you can, then move to the next step.

Go to the starter, check the wiring, make sure it is intact. Check for voltage to the large diameter wire on the starter, test light, voltemeter, etc... If good voltage(and make sure the battery is good, actually should do this first) jump across the small terminal on the starter to the large terminal. The starter should turn. If not, starter problem, If so, then move to the next step.

With the voltmeter,test light, hooked to the small diameter wire terminal on the starter, have someone turn the key to start, should get voltage there. If not find out why, starter relay? faulty ignition switch?

These steps are a little out of sequence for quick no start troubleshooting. I have arranged them in this order as this car is old enough so that problems may be masking normal diagnostic procedures.

Check the battery first..
 
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