D-180 EMS works fine on internal battery. Turn on external power and CHT's / EGT's go up 100-200 degrees, Fuel levels go to zero, oil pressure off the chart, oil temp down 50 degrees, amps go to 99. What can be checked? What might be wrong? EFIS side still working properly.
EMS haywire on external power
- Thread starter dbiddle
- Start date
New behavior or is this a new install (and has always worked that way). Off the cuff, either voltage is getting injected somewhere where it shouldn't on the EMS connector that's somehow related to ship's power. Possibly the fuel flow sensor if you're powering it from ship's power instead of the EMS's 12V output. If this is new behavior on an existing installation, has anything changed the aircraft recently?
I have been using the D-180 for several months, but RMI Amp sender would not work and MAP indication would jump around so i changed out from the Rocky Mountain amp sender to Dynon shunt and MAP sender to Dynon MAP. I re-checked the 37 pin connector and everything looks right. Have i reversed AMP + and AMP - ? Something with the MAP wiring? Which misswire would make this happen? Thank you for monitoring this forum and for any direction you can give me.
Is the amps shunt on the positive side of the electrical system? If not, that can mess readings up. Also, sometimes people get the A/B/C connections on the MAP sensor mixed up. That can mess up the 5V line, which is also an internal reference. That can also have odd effects on readings.