Symptom
The motorhome monitor
LED does not illuminate,
even though the brakes in
the towed vehicle are being
applied.
InvisiBrake doesn't stop
braking when the motor-
home brakes are released.
It keeps braking for about
15 seconds.
Turning the hazard lights
on causes InvisiBrake to
cycle on and off with the
lights for a few seconds.
I’m not braking the mo-
torhome, but the motor-
home monitor light stays
on.
The air compressor is
running, but the pressure
gauge is not showing any
air pressure.
Solution
• Make certain the brake light fuse was replaced in the towed vehicle.
• Make certain that the monitor wire patch cord between the two vehicles is se-
curely connected.
• Make certain that there is an electrical ground between the motorhome and the
towed vehicle.
• Check for power at the stop light switch, at the front of the vehicle and at the
LED in the motorhome.
• Check for power at the back side of the LED light when the brake pedal is held
down in the towed vehicle for approximately 20 seconds. You should hear an au-
dible alert after 20 seconds which proves there is power to the harness just before
the LED. If you hear the audible alert, verify proper power and ground connections
at the LED light. You can also provide positive 12 volts and ground to the LED to
determine if the LED has failed.
• The monitor LED is connected to the towed vehicle’s brake light circuit. If the fuse
in the circuit is blown, the LED will not operate. Check the towed vehicle’s brake
lights — if they illuminate when the brake pedal is depressed, the fuse is good.
• Was the optional Brake-Lite Relay installed? If so, make certain that the monitor
wire is connected to the towed vehicle’s brake light wire after the brake light switch,
but before the Brake-Lite Relay — connecting the wire anywhere else will prevent
the monitor LED from functioning.
• If the towed vehicle has been wired for towing (as opposed to installing a bulb
and socket kit), diodes must be attached to the wires. If diodes are not attached,
electrical feedback through the brake light wire will prevent InvisiBrake from releas-
ing until the extended braking protection mode overrides the brake light signal, after
approximately 15 seconds.
Likewise, if a ‘plug and play’ electrical harness has been used, diodes must be
installed to protect the towed lighting harness. (Most harnesses of this type only
have diodes to protect the towed vehicle’s electrical circuits.)
• This is normal — the hazard lights use the brake light circuit, which is what acti-
vates InvisiBrake. It takes InvisiBrake three or four cycles to recognize that this is
not a brake light signal. This cycle will start over each time the hazard lights are
turned on.
• Readjust the brake pedal clamp.
• The cable is bound or obstructed. Inspect the cable assembly from the brake
pedal to the cable anchor bracket.
• Incorrect cable adjustment — refer to the installation instructions for proper ad-
justment.
The air pressure is set at maximum. At this setting, the needle has rotated com-
pletely around the gauge, making you believe it is at zero.
To confirm that the compressor is operating properly, pull out on the brake pres-
sure adjustment knob and rotate it counterclockwise. The needle will move as you
lower the pressure. Adjust to desired pressure setting.
Troubleshooting
continued from preceding page
6
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