Couple of questions.. RPM, amps and ECU ground

I have not started the engine yet, I am wiring up all the electronics before I can close our my avionics bay, I have a bit more work on plumbing the gasoline, so I can't start until I do.

Is there anyway to verify the RPM is wired correctly without getting the engine fully started? Will it read during cranking?

How Can I tell if the ECU is on? While the ECU had a power lead, I don't find a ground lead. Is this connected directly to the pre-wired part in the engine?

Also I wired the AMP shunt for the Dynon ECU between the alternator and battery, this should show charging amps, but when I turn it on it shows -3 amps discharge. I don't think I should be able to measure discharge from that location. Is this normal or does it require calibration?

Thanks

Jonathan

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Permalink Reply by Loren Warner on April 7, 2019 at 9:01pm

Our Grand Rapids EIS with a Hall Effect Current Sensor also reads -3 until the engine is running, then it reads the charging current.  Our sensor is located between the alternator and batteries/buss loads. 

Hopefully Jan will chime in soon on your other questions.

Permalink Reply by Jonathan Fay on April 7, 2019 at 9:02pm

Thanks! That was super helpful!

Permalink Reply by Keith Thomas on February 3, 2021 at 7:51pm

where did you pick up the rpm from if you have it shown on the Dynon.

Permalink Reply by Jonathan Fay on March 4, 2021 at 3:22pm

Connected RPM input on Dynon to RPM wire on Viking. Might have had a pullup / pull down resistor involved in the setup.

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