[ddfour1]

I had previously cut back and put a new terminal on the ground wires but not the positive wire. Last trip out I put a new spade on the positive wire and then I tapped into both the positive and ground wires and ran test wires to the helm so I could monitor voltage to the tach while underway.

The issue must have been a bad connection at the positive post because the new spade on the positive wire seems to have eliminated the problem.

After start-up and while idling out of the harbor I was measuring 12.1 volts going into the tach. As I slowly throttled up, the voltage increased correspondingly, likely because the alternator output was ramping up with the throttle. By 1500rpm I was measuring 14.1 volts going into the tach and it was not bouncing and no longer cut out when I turned the panel lights on.