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Aircraft Maintenance TroubleShoot > Alcor EGT and CHT Troubleshoot How to check the Alcor EGT probeAlcor EGT meters with type K or type E probes may be checked with a multi-meter using alligator clips. Care should be taken to be sure the meter and lead are disconnected from the probe before checking for resistance. A typical grounded type K or type E probe will show 0.6 to 1.0 ohms through the probe. There are some planes with ungrounded systems. These include some Mooney and Piper aircraft, as well as some other meter manufacturers. Remove the EGT probe and carefully heat the tip. When the probe is cherry red the millivolt response should be 33 to 36.4 millivolts or 1500F to 1600F for type K (red/yellow wire). Type E (red/brown wire, used on early EGT systems) should read 61 to 67 millivolts or 1500F to 1600F.Color codes must match throughout the entire system from the indicator to the probe, including the lead wires. CAUTION - voltage from a multi-meter can damage an EGT or CHT indicator Care should be taken to be sure the meter and or the probe have been un-hooked before checking for loop resistance. A grounded type K probe Will normally show from O.6 to 1.0 ohms. The same goes for type E or red and brown probes. Type J CHT probes will show a reading of about 0.24 ohms.
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