I'm a bit of a fanatic about good grounds as they can be a real bugger to trouble shoot. I'm re-installing my 582 and cleaning up the engine wiring mess the builder made. I have the ground coming from the "alternator" and a ground from the regulator that go together. Also in that connection a ground that goes to the engine. Shouldn't I also have a ground from the engine to the airframe? Looking at the engine mounts I don't see a good ground unless it is by accident through something else. Seems to me there should be a ground strap from the engine to the engine mount bolt that goes through the lord mount.