70 up charging system upgrade question

70 up charging system upgrade question

Thanks Dave, I will give that link a read thru.
It cranks with key so I'm sure relay is good? I have also jumped direct at starter relay with screwdriver and it cranks. Relay was new as well.
I will pull ecu and check mounts for ground. Also for harness connector tightness.
Voltmeter is a "no name" Innova. I checked it against another to verify. Seems good? See pic.
I got a hunch there is more than one issue. I gotta read thru my previous test results but it seems like an intermittent voltage drop leading to the key.
2nd possible issue, could my upgrade to 70+ be wired wrong?
Up until the past couple days, I didnt realize you measured for voltage "drops" the way Mattax drew it out. Again a visual learner here lol.
Thanks!

Daves69 said
Out of curiosity, what DVM are you using?

It may be just fine as is.
I know paint, especially when new, is a hard thing for anyone to scrape off just for a solid ground. Coating on the ECU case can be an issue as well. A ring terminal and separate ground wire under one of the bolts might be an option to consider.

On the volt scale going from ground to ground you'll see nothing. If you go positive batt to negative case is where you'll see any voltage difference compared to across the battery posts.

Not sure on that. In key start any voltage on it?
See post 3 here...……..
Starter won't engage when key is turned.

Does seem to me 12 V to the positive coil (hot wire) should fire in start or run with the key switch unless somethings acting as a kill switch on you?
Do you have a tach or condenser on the coil you could take out of the system while testing?