It never has a problem cranking and I checked ohms between negative battery terminal and block. Where would you add a ground (location on engine)?

I feel like a ghost hunter here or something. I hooked up voltmeter between lugs on solenoid and fed power straight to trigger lug from battery with remote start cables and every time I press the button the voltmeter ohms zero out immediately.

Really hard to diagnose when the problem hides for days at a time...