Anyone have any tips for diagnosing tachometer on 1990 FLHTCU Bike runs good. LOTS of miles.. New S&S HI-4 ignition last year. Tach quit not long after the new ignition. Wiring all looks good Maybe a bench test procedure?
Its just a signal driven head. Ground, lamp power, and signal are the wires. I would just verify the ground and power, then use a old school dwell tach to see if there is signal from the coil.
Past that, where do you find a replacement. The tach on my 84 went bad, the needle hangs up at 1000. I'm on my second replacement from J&P and they both are bouncing all over the place.
Thanks for the reply! I verified power and ground, at the rear of the tach. So, with your suggestion, I will test for signal from ignition. Good idea! May have to remove fuel tank, for access to coil.. for further testing..
Found it! It was a loose crimp, on a spade wire end connector.. New spade terminal, good crimp. Works fine! Thank YOU!