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Condition Display Problem Cause Possible Solution
Display shows 'not connected' when power is
applied to controller. No trailer brakes when
brake pedal or manual control is used
No connection between brake controller
and trailer brakes – blue wire circuit
Confirm connection to trailer connected
Confirm connector terminal positions
Check trailer
No trailer brakes, pedal or manual
Short or overload in trailer brakes Troubleshoot trailer brake circuit according
to the brake manufacturer's instructions
Trailer brakes work but error shows
Miswired trailer, wiring shorted or bulb out Check bulbs
Check for possible shorts
No trailer brakes, pedal or manual
Short to trailer brakes in
wiring or brake assembly
Check for shorts in wiring and in each electric
brake. You may see or hear the wiring sparking
No trailer brakes, pedal or manual
Electrical connection failed Check connector for fit and blockages
No trailer brakes, pedal or manual
Loss of trailer connection,
unplugged or bad wiring
Stop and check trailer connector
TROUBLESHOOTING GUIDE - WITH TRAILER CONNECTED
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