Re: 1972 starting issues

Posted by Hal of Washington on November 02, 2009 at 16:00:21 from (208.81.157.90):

In Reply to: Re: 1972 starting issues posted by Justin Capps on November 01, 2009 at 17:37:29:

I would suspect the ignition switch or neutral safety switch. To see if the starter and solenoid are working OK, I would hook up a remote starting switch that attaches to the posts of the solenoid. It is important to make absolutely sure that the transmission is in neutral, so there is no chance that the truck could move when you press the start button. If the starter turns the engine over when you engage the remote start switch, you either have a wiring problem or the ignition switch and/or the neutral switch is not working right.

If the problem only occurred when the engine was hot and it had sat for a few minutes not running, I would suspect the problem was in the GM solenoid design. The solenoid would heat-soak and the amount of electricity that it got from the ignition switch wiring was not enough to fully engage the solenoid. The fix for that problem was to use a Ford type solenoid on the fender wall to give full battery power to the GM solenoid. It worked for me.

I also have run into battery cables that had corroded inside the insulation. They looked fine from the outside, but the copper wiring inside had mostly turned to blue powder. The remaining strands of copper were enough to make the lights and accessories work, but the truck would not start well, especially when the engine was hot. New cables fixed that problem for good, but it sure puzzled me for a long time before I figured it out.

But if your pickup has an automatic transmission, I would bet that the problem has to do with the neutral start switch. Good luck!

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