From:Dave Hennessey
Subject:RE: RE: RE: RE: RE: RE: RE: RE: RE: RE: Electrical issue with 63 scat Date:Sun Jun 12 11:48:02 2016
Response to:21314

Let's review the configuration from top to bottom.

The top coil is the headlight/taillight/horn coil.

The top circuit breaker is the ignition circuit breaker.

The breaker cam is a two-piece unit. One cam drives the ignition breaker and the other drives the stop light breaker. They should go together only one way.

The bottom circuit breaker is the stop light circuit breaker.

The bottom coil is the Ignition/Stop light coil.

The simplified schematic show below may be of some use in tracing the wiring, as the regular wiring diagram is somewhat confusing. You may want to disconnect parts of your harness, and test-wire the ignition according to the simplified schematic.

The horn sounding while kicking indicates that the lighting/horn coil is good. It's also a good indication that the rotor is good. I don't think the rotor can be partially bad. Even if possible, it is the hardest thing to swap, so I would leave it until all else fails.

Is it correct that you've swapped out both points, the condensor, both internal coils, and the external coil with known-good ones? That only leaves a few things - the cam, the wiring, and the rotor. (And the spark plug, which I assume you've swapped with a nice new one).

Verify that the 2-piece cam is installed correctly, and that both points open at different times.

Verify the wiring harness matches the simplified schematic. Verify using the ohmmeter on your new $20 multimeter that the wires are good.

Run a wire from the external coil case to an engine ground. Is the external coil case really grounded?

Disconnect the stop light by either disconnecting the wire, or by putting tape on the lower circuit breaker. If the stop light wiring were somehow totally grounded, it might prevent the ignition from firing (shouldn't but...)

Using the AC Volts feature of your multimeter (hopefully it does AC volts). Hook to the hot side of the horn and to an engine ground. Crank the motor. You should see the needle deflect. Try again at the terminal of the ignition circuit breaker (top), and the stop light circuit breaker (bottom). Does the needle deflect?

At this point, it's either the rotor, or it's still somehow mis-wired.

Let us know what happens!

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