Engine start up, Problem 3: Weak Starter Options

[OU8AVW]

I'm working through starting my freshly rebuilt 2056. It has the original D-Jet and is a 1975 motor. At first I had no fuel pump, I fixed that.

Now there is no spark from the coil. I traced the lead from #8 on the fuse box to the relay board then out the relay board. I have 12.4v at the coil positive but no spark. I'm testing it with a light-type tester. No bueno.... It is a Bosch coil, i believe it is a "blue" coil.

I read here that there should be 1.5 ohms resistance between the two poles on the coil with everything dissconnected. This one tests at 7.4 ohms. A spare coil I had had similar results with no spark at crank and 4.6 ohms resistance.

I assume i need a new coil......
Right?

[Cap'n Krusty]

"New coil"? Hardly EVER. Look at the wiring to the negative side of the coil, look at the points and the points plate ground strap. If you have a points replacement unit, such as a Pertronix, it may have gone bad (generally from operator error, but they also just quit). You can easily test the coil by removing the points wire and the tach wire off the (-) side of the coil and momentarily ground, then unground, the terminal, which will cause the coil to fire. (See the above post.)

The Cap'n