Question about 2004 Ford F-350 Super Duty
Check power to trailer brake
12 volt test light or amp gauge. Trailer brakes use 2 wires... 1 ground and 1 hot. The hot has varied amps to apply according to the controller. 12 volt test light works great. use the white (typical) as your ground and the blue (typical) as your hot. Apply brakes. Light should get brighter as the controller is turned up and dimmer as it is turned down. I hope this helps.
Posted on Jun 27, 2014
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Posted on Jan 02, 2017
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