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Re: 5.3L LS won't fire
It looks like several of us have run into this same problem over the years.
Meaning that that truck is designed to get power to the coil through the resistor bypass on the solenoid when you are cranking.
My experience was on a well tuned truck that the bypass wire got left off for one reason or another. You would crank it and it didn't fire but it would fire when you let off the key but just let it go to the on position.
What you may have to do is install a "start" button that acts as a resistor bypass switch when you are cranking the engine. Maybe one that is hidden under the edge of the dash were you can get it with the tips of your fingers. Or wire in a relay that works off the start pole of the switch and provides momentary power to the red wire.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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