[urbanhunter44]

I'm having a no spark problem with my new motor. It's an HEI coil in cap style distributor that was known to work, also has a fresh coil. I have a constant power supply with the key on to the small connector from the wiring harness to the cap. The control module was tested and is good. The cap/rotor are in fair condition.

Looking through the wiring diagrams I noticed that a wire goes to the starter from the coil. Reading through this site I see that it's said this wire transmits 12V to the coil on starting, however I'm unsure if this is a points only thing or if I need it for my HEI setup.

There is a third wire down at the starter, it has a constant power supply with the key on (tested with lightbulb style tester). I did not attach it and the starter works.

Can someone please clarify for me the coil to starter wire and what the constant wire at the starter does? I really want to get this beast running

Thank you!

 

[mychevyii20]

See my HEI Rewire page. That may help explain what wiring changes are needed for the HEI and why the wires ran to the starter first for points. HEI needs 12v all the time.

 

[The Big Al]

The best bet is to run a wire from the ignition powered accessory in the fuse box to the dist.

The factory ignition power wire is a resistor wire. If you use this power, the wire itself from the firewall must be replaced with non- resistor wire.

The wire from the starter to the coil is a start bypass, it's a good idea to use this also.


AL