Bruce,
I bet you have a loose or corroded ground connection on the M151.
Some slave receptacles are grounded to the chassis, others to the battery.
If your slave receptacle is grounded direct to chassis (rather than to
battery), when you hook up your wrecker you are grounding through the wrecker
through the slave receptacle to a DIFFERENT point on your M151 than the
M151's own battery system grounds to, which bypasses the problem area.
Hope this helps,
David Doyle
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