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Finding the cause of a short circuit in the system is done by isolating one
section at a time. If the high amperage reading drops to zero by unplugging the
trailer, then the short is in the trailer. If the amperage reading remains high with
all the brake magnets disconnected, the short is in the trailer wiring.
All electrical troubleshooting procedures should start at the controller.
Most complaints regarding brake harshness or malfunction are traceable
to improperly adjusted or non-functioning controllers. See your controller
manufacturer’s data for proper adjustment and testing procedures. For best
results, all the connection points in the brake wiring should be sealed to prevent
corrosion. Loose or corroded connectors will cause an increase in resistance
which reduces the voltage available for the brake magnets.
Braking Systems - Electric
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