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Re: wire position for 75 Chevy 350 HEI on the
Order is 18436572. Put the timing mark on the crank at 0 and the rotor should be pointing either to the firewall or the front of the engine. If at the wall, turn the crank one more time and it is now pointing at the #1 wire position on the distributor. left side cylinders are 1357 right, 2468 wire order is in the direction the rotor turns when cranking.
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Wiring diagrams for 1980 trucks are contained in a separate Wiring. Diagram Booklet.... Some of these service operations require the use of tools specially designed .... 1-1/2 Ton. 2-3/4 Ton. 3-1 Ton. 4-1/2 Ton (W/HDSusp). Fig. 0A-3-Vehicle Identification Number ... Right Hand Side of Cylinder Block at Rear of Distributor.
need to know if its a HEI cap and rotor or not. HEI caps have the coil built into them , an all in one ignition as compared to a external cylindrical coil.
you need to know that. either the distributor cap is a huge hurken thing (HEI) or it has an external coil somewhere or the cap has a ninth distributor hole in the middle of the cap to put a coil. wire.
after you figure out which one it is then you have to either go to www.autozone.com and study chevy wiring or buy a haynes manual for the similar vintage engine. for the external coil I would try a chilton manual for a chev truck before 1972. for HEI anytime thereafter.
I may be off by a few years on the age of the engine. but hopefully you got an idea of what to do, or just google chev engine wiring? and study away.
Check the distributor module (ICM), it may have gone bad and needs to be replaced. It's around $40.00 and it's under the rotor in the distributor assembly. Check the red lead wire to the HEI for voltage, there should be 12 volts. It common for the ICM to fail on the HEI system and if you go to Auto Zone, they can give you the step by step instructions to replace the ICM.
Good luck and keep me posted, be glad to help.
If the Electrical system is grounding out, particularly the hot lead to the coil. then you will fry coils. Check your Positive leads at the fuse box for continuity to ground. 1st check the ignition wire i.e. red wire going to your coil. Disconnect the ignition wire from the coil or distributor (depending where your coil is located). If it has continuity to ground, then go to your fuse box and pull out all your fuses and test each terminal for continuity to ground until you find which circuit is grounding out and polluting the rest of the positive circuitry. If it is only the ignition hot wire then you know that is where the problem is. If it is coming into the fuse block from another positive source, isolate that source by not allowing it to come into contact with + current.