Ok, the finale!
So first off, ML Toys ignition cant carry the current, despite what they claim. But my kid liked the big blue key, so i found a lock cylinder that was basically identical, on Amazon, for $9, so i bought that. Then i grabbed a 12v 80a relay i had kicking around the garage, and wired that in:
I know 80a is way overkill (30a would prob be fine), but i already had it, and i figure since its 18v not 12v, having a big buffer wont hurt. So the key switch triggers the relay, which is mounted here:
In retrospect i should have just done this from the beginning, i was thinking K.I.S.S. and you dont get simpler than just a key switch. Anyways, this completes the wiring overhaul. The little dude was romping it around the yard and ran it for a good half hour in the grass with no sign of it slowing down. The voltmeter said we were still over 18v, so im guess a good hour plus on the run-time now, maybe longer
So with this done, theres nothing left to do but to just let the little dude cruise!
Nest up is to finish the wiring issue with the '96, and then its finally time to start the one-ton swap on the '90!