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Optional Brake-Lite Relay Kit (part #88400)
CAUTION:
DO NOT USE BRAKE-LITE RELAY ON ANY FORD THAT HAS A “NEUTRAL TOW
KIT”. USE OF THE BRAKE-LITE RELAY MAY PREVENT DISENGAGEMENT OF
THE TRANSMISSION FOR TOWING, CAUSING SEVERE NON-WARRANTY
TRANSMISSION DAMAGE. For all vehicles that have a Ford “Neutral tow kit” either use the
Brake-Lite solution on the following page or install Roadmaster’s Bulb & Socket kit #155.
Installation Instructions
1. Locate the towed vehicle’s brake
light switch. Cut the cold side of
the brake light wire a few inches
downstream from the brake light
switch. CAUTION: Verify that you
have the correct wire. When
the wire has been cut, with the
key in the “on” position, put your
foot on the brake. If the brake
lights remain on, you’ve cut the
wrong wire. Once you have
located the correct wire, install the Brake-Lite Relay in line as shown in Figure 9.
WARNING: Make sure that you install the 10 amp fuse assembly within 6” of the power source.
With Brake-Lite Relay Kit installed, the towed vehicle’s brake lights will ONLY function when
the towed vehicle’s ignition is ON.
!
Figure 9
Brake Light Solutions
IMPORTANT! Depending on how your towed car is wired for lights, it is possible that the brake lights will
override the turn signal. This occurs when the brake light power (from the towed car) overrides the turn signal
power (from the motorhome). In short, the towed car is trying to flash the turn signal, but the power from the
brake keeps the bulb illuminated preventing it from flashing. You can solve this by adding the Brake-Lite Relay
Kit number 88400 or by adding additional wiring diodes to your towed car. Detailed instructions for both
solutions follow. Alternatively, you can install Roadmaster’s bulb and socket kit #155.
2. Using fuse tap, connect the blue wire from the
Brake-Lite Relay to the “HOT” side of any fuse
which is powered ONLY when the towed car’s ignition
is turned on. NOTE: The “HOT” side of the socket is the one that registers voltage when the fuse is
pulled, the ignition switch is on and tester is connected between the socket and ground.
3. Connect the black wire to any good chassis ground.
4. Secure the Brake-Lite Relay and wiring harness using enclosed zip ties.
5. Test System: a. When the car is running, the brake lights will function normally.
b. When car’s ignition is off, brake lights will not function.
NOTE: Do NOT drive your vehicle if the brake lights are not functioning normally.
WARNING:
!
Fuse Tap
ATC Fuse with
the Fuse Tap
installed
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