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PAGE 18
Condition
Display
Probable Cause
Probable Solution
Display does not light
up when brake pedal or
manual control is used
Blank
No power to controller,
no ground, reversed
black and white wires,
circuit breaker blown
Check and repair
connections. Refer
to the 'wiring' section
Display shows
'Not Connected'
Red wire connected to the
wrong side of the stoplight
switch or to wrong wire
Check and repair
connections. Refer
to the 'wiring' section
Display shows 'Low Volt'
- can occur with
the trailer connected
Tow vehicle's system
voltage low
Check tow vehicle's battery
and charging system
Display shows 'Short'
when manual control
is applied
Red wire connected
to ground side of
stoplight switch or
is shorted to ground
Check brake controller
wiring, may require change
to switch setting. See
'manual control' section
Display shows 'Overload'
when the brake pedal or
manual override is used
Short in blue wire output
circuit or trailer plug
Locate and correct short
Display shows nothing
when battery power has
been connected for a
period of time and the
engine is not being cranked
Blank
Inadequate battery
or ground wiring to
brake controller
Check brake
controller wiring
No Trailer Connected
TROUBLESHOOTING GUIDE - TEST WITHOUT TRAILER FIRST
* This guide is for reference only. If problems persist, see a professional installer.
