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Found 2 results

  1. 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
  2. Both of my pressure gauges (oil and fuel) are reading low (about half). We (my A&P and I) put a mechanical gauge in the circuit and verified the electrical gauge readings are low. We've checked wiring connections, power and ground. I've checked the sending units and not sure the resistance is correct. The sending units doesn't appear to be the original ones. I'm concerned that they may have been replaced with the wrong resistance units. The fuel pressure gauge is 0-30psi The oil pressure gauge is 0-100psi Can someone tell me: 1) What should be the resistance ranges of the sending units? 2) What should be the voltage on the wire with it disconnected from the sending unit? I'm reading about 2 vdc. This is a new plane to me and I have the service manuals ordered but haven't received them yet. Any help or ideas are welcomed!
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