ok sleepywheel,
you found a short to ground in one motor
could be
do one other thing when you get the motor back in the truck
check the battery for grounds to frame on pos and neg sides
if you have any take the battery out and isolate it away from the truck frame so when you have it plugged in that will not be interference with your testing. reason i say this is battery shorts to frame can cause all kinds of strange problems, if you take that source out of the equation then finding other ground shorts are easier :o)
good luck
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