Re: 420 Front PTO engagement issues
Mark, 0.1 ohm means coil is shot. I've never used the Xtreme products so can't comment...but have seen good recommendations here and on other sites.
Let me try to explain the readings you got and what's going on inside your coil. Your coil is a single piece of wire going in, winding around and around, and coming out. This wire has a VERY thin varnish insulation and expansion/contraction of the wire due to heating/cooling can crack the insulation. I'm not sure of the exact wire size in the coil, but I know it's small and will assume a 20 gauge wire. 20 gauge wire has a resistance of 10 ohms per 1000 feet and a good coil should have a resistance of 4.0 ohms, so it should have 400 feet of wire in the coil. Your getting 0.1 ohms resistance so the current is flowing in 10 feet, finding a crack in the insulation, jumping to the next wire, and coming back out to the plug...rather than traveling the entire 400 feet. It's still a single wire so your continuity "tone" will sound...unless the wire was burnt in two, but then you would have 0.0 ohms! Infinite resistance from either wire to case simply means the crack in the insulation connects wire to wire and not wire to case.
I hope this helps you understand, Bob