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Voltage spike
Posted: Fri Sep 23, 2016 4:45 am
by orford2004
When I run megalogviewer, I have voltage from 9V to 22V even with a brand new alternator. MS2 3.0
What can cause that?
Re: Voltage spike
Posted: Mon Sep 26, 2016 6:42 am
by Matt Cramer
Where is the MS2 grounded, and are you using low or high impedance injectors?
Re: Voltage spike
Posted: Mon Sep 26, 2016 5:53 pm
by orford2004
Ms2 ground on the engine block and low impedance injector
Re: Voltage spike
Posted: Tue Sep 27, 2016 5:43 am
by Matt Cramer
Try this mod:
1. Cut the center leg on Q9 and Q12 or desolder it so it does not reach the PCB.
2. Run a length of jumper wire from the center leg of Q9 and Q12 to an unused pin on the DB37 connector.
3. Wire this pin to a 12 volt source in the wiring harness, separate from the Megasquirt's power supply wire.