Something about the fact that you have been reporting humming bothers me. batteries and DC supply systems (real DC, not rippling DC like voltage) should produce no hum. If your controller (I do not know what it uses for output) produces pulse width modulated DC) it would hum. I would do these tests: measure pulse DC voltage across the magnet at the magnet ground, and magnet input, (might take a Fluke Meter) with ----- marks on the DC meter position) when applied fully. should read 12+ volts and be locking the wheel. I would next measure the amps on the wires going to the magnet when using the charger to make it work. Even a good amp meter from a tractor would work. it should show ~ 5 or more amps. I would measure the voltage at the plug connector wires (while connected) to see if it is actually getting power when applied through the truck system. A 4th test is to use a jump pack or good 12v battery at the connector in place of the charger. If it works there, it is the truck, not the trailer. My bet is on a bad truck ground, or connection in the truck. I just experienced a faulty connection in a Jeep from the key start position to the starter (tiny box) relay. it measured 12+ volts when disconnected, but would not latch the relay (probably only took 100 milliamps to make it engage). When loaded with the relay the voltage was 0.2v. I bypassed the wire in the loom and all is well. Jim
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