Product Manual

Condition Display Probable Cause Probable Solution
Decimal point does not
light when brake pedal
or manual control is used
Blank No power to control,
no ground, reversed
black and white wires,
circuit breaker blown
Check and repair
connections. Refer
to the 'wiring' section
Decimal point on after
30 min of inactivity
Decimal
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 L.b
Can also happen with
trailer connected
Tow vehicle's system
voltage low
Check tow vehicle's battery
and charging system
Display shows E.1. when
manual control is applied
Red wire connected
to ground side of
stoplight switch or
is shorted to ground
Check brake control
wiring, may require change
to switch setting. See
"manual control" section
Display shows OL when
brake pedal or manual
override is used
Flashing
Short in blue wire output
circuit or trailer plug
Locate and correct short
Display shows -- when
battery power has not just
been connected and the
engine is not being cranked
Double dash
Inadequate battery
or ground wiring to
brake controller
Check brake control wiring
No Trailer Connected
TROUBLE SHOOTING GUIDE - TEST WITHOUT TRAILER FIRST
PAGE 18