1973 Scamp won't start in start only in run. With a Twist....

moparmandan said

So let me restate this and ask a specific question. We have 10.5 volts at the coil during ign2. We have 6 volts at the coil during ign1. It won't start When cranking until you let go of the key switch back to run. Question is what controls the other side of the coil during crank and run? Is pin 2 of the ECU in play for both ign1 and ign2?

Click to expand...

I think you surely must have a wiring problem, crossed wires, something.

the ballast / coil wiring (taking that separate) works just like it always did with points, no change. IN FACT let's say your ECU went bad on the road. You could yank the dist. out, slap in a "points" dist, hook up to the coil NEG, and unhook the ECU wire that had been there and drive on.

This is simplest breaker point circuit I can find:



ONLY difference between this and the newer "4 pin" ECU is that the ECU has a wire going from ECU to coil NEG which switches the coil just like points.

The IGN1 (run), the ballast, and IGN2 are all unchanged, points or electronic.