OK, when you get back to it, put together a bulb tester. Take the 20 ohm straight out and put a 100 watt lightbulb (incandescent) there.

Then you start disconnecting things.

That is probably the only way to troubleshoot this. You ain't finding anything with the ohmmeter, but it isn't shutting down. Something is not showing up unless under voltage. Ohmmeters can't detect that.