Continuing the troubleshooting I took a look at the deck wiring by
removing the wire cover plates. All looked good so I started taking off
the motor wires to isolate the problem.
Sure enough with the center motor disconnected (the oldest one) the
ground fault disappeared. So it's in the motor. I took this one apart to
check and lubricate the bearings and clean out all the accumulated dust
and junk, so it's not that.
Either it's a short in the armature or in the brush housing. I don't
think it is the armature, as a winding short would only ground fault in
certain rotation points and this is faulting everywhere. So I'll pull
off the cap tomorrow and have a look at the two posts. One of them might
have a damaged insulator sleeve....
That and fixing the wire on the main motor with a new lug should fix all
the problems until I can get around to dropping and pulling the drive
motor. Maybe in the fall because I need it now for mowing.
C
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