ELECTRIC BRAKE VOLTAGE NOT ZERO

I believe you need AC to get an Eddie to flow.
I have a Prodity brake controller and with the camper plugged in a "C" appears on the controller, so a small voltage is applied to the brake circuit to check for continuity. If the plug is disconnect "NC" is displayed for 15 seconds.

If you are talking about induced voltages yes you need ac voltages

If you are talking eddie currents(meaning circulating) you will get these in dc circuits where you have different voltages. The current flows from the high voltage to the low voltage.

Much the same as wind. High pressure to low pressure.

Cheers
Garth

Measuring the voltage at a 7 pin plug which would be disconnect thus no flow how is ever possible to induce a voltage in the parallel wires.

I have just spent the better part of 2 1/2 hours tonight trying to track down a fault with my brake controller. Tested all the connections, pulled the trailer plug apart, cleaned it all and scared a couple of small spiders. Took the plug on the car apart and blew out tonnes of dust, and still no joy.

In desperation started following the wiring back under the van. Child # 2 was sitting in the car and in between re-tuning all my radio stations put her foot on the brake at my command (or plea).

I finally worked out the problem was a corroded connection on the earth wire returning from the brake to the earth wire on the plug.

It appears that the Prodigy brake controllers emit a low voltage current through the brake, which is returned via the earth wire to the unit and when this circuit is completed, the brake unit is active. If the circuit is not complete the unit is turned off.

Of course, the problem has been there since the last time I used the van. Nothing like planning ahead as we leave on Christmas day!

Posts 27870 and 48405 also cover this topic and if you want to waste an hour just Google "electric brake controllers voltages".