Hey Guys,
I’ve been having an issue with my volt meter for the last few months. It intermittently fluctuates above and below the actual 28 volts. I have a EDM 700 and the voltage remains steady at 28.1 volts and I have also tested it with a Fluke meter. It’s definitely the instrument indicating incorrectly vs the actual buss voltage fluctuating. My mechanic has cleaned the plug behind the instrument and the canon plugs in the wiring harness. The wiring diagram shows five wires, one ground and two wires to the load and alternator shunts. In the video you can see how the voltage fluctuates above and below 28.
Any ideas? Could it possibly be the instrument itself?
The plane is a 1988 M20J 205.
Thanks,
Simon
848D9A40-5045-40A2-A72C-E7AD1901E6A6.MOV