VashonFarmer
Bronze Member
It sounds to me like a problem with the relay. I had a similar issue, tach wouldn't work, lights, and horn too if I remember right. Investigated wiring diagram and identified a relay under the steering wheel. I removed and replaced that relay and the problems went away. You can take a relay from under the hood (hi/low lights I think) and use as a replacement to test if the problem goes away.
Reference this thread here also...
https://www.tractorbynet.com/forums/bobcat-tractors/220165-tach-electrical-issue.html
I appreciate the thought on that one, but I've already been through the relays and went ahead and replaced three of them: the ignition, starter and pull coil relays. And my issue is a little different in that the only gauge that stops is the tach while all the other electric circuits are unaffected until I turn the machine off. I spoke with the local service tech today and have decided that I just need to order the OCU and cross my fingers. I'll update this when I install it next week.