Do the lights dim at all when the items are tried? This would indicate a drop in all 12 volt power when the motors are activated.
You will need to measure the voltage downstream to see what is going on. If you can get to one of the motors that would be perfect. Measure from the hot wire to the ground wire. Odds are you will see a very low or no voltage at all.
Then measure from the hot wire to a metal surface that should be grounded. If the 12 volts measures good from the 12 volt feed wire to ground, then the problem is in the ground wire connection from the motor. If it still shows low or no voltage, the problem is in the positive 12 volt feed. If there, I would measure at the fuse panel next.
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Jim
Retired electronic technician (45 years in the field)
2017 Greyhawk 29W (solar & many other mods)
wife (maybe I should have given her top billing)
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