tow bars - Roadmaster Inc.

Brake-Lite Relay
and stop light switch
applications
Towing and Suspension Solutions
What does the Brake-Lite Relay do?
It stops the brake lights from functioning until the vehicle is started. This prvents the towed vehicle’s brake signal
from overriding the motorhome’s turn signal.
When you tow without the Brake-Lite Relay, your towed vehicle’s brake lights alone will work fine. Your turn
signals alone will work fine. But if you’re braking and turning, the brake light from the towed vehicle will override
the turn signal from the motorhome and drivers behind you will be unaware you’re about to turn.
Do you need a Brake-Lite Relay?
You only need a Brake-Lite Relay if you’re installing a supplemental
towed vehicle braking system that pushes or pulls the brake pedal.
Exceptions –
• With the engine off step on your brakes. If the brake lights do not illuminate,
you do not need a Brake-Lite Relay.
• If you’re using magnetic tow lights or a bulb and socket wiring kit, you do
not need a Brake-Lite Relay.
• If both your motorhome and towed vehicle are wired for separate brake
and turn signals, you do not need a Brake-Lite Relay.
88400 Brake-Lite Relay
Comes standard with Even Brake ® .
• Wiring and components included
• Easy to follow instructions
Why do I need a stop light switch?
For two very important reasons:
• A stop light switch and 10-amp fuse must be installed in some towed vehicles to enable the brake lights to illuminate
with the ignition key turned to the “tow” position, which is required by law.
• What does the motorhome monitor actually monitor? Most indicate when the supplemental
braking system is activated. ROADMASTER uses a stop light switch to connect
BrakeMaster, Even Brake, Invisi-
Brake and 9700 monitors to the
towed vehicle’s brake light, so you
always know when the brake pedal
is depressed and released.
That’s an important distinction.
Say you position the braking system
too far forward, so it’s riding
on the brake pedal. Most monitors
will indicate nothing. ROADMASTER
monitors accurately indicate continuous
braking, which notifies you
of a problem before you even drive
away. Systems that monitor the
supplemental braking system only
would not indicate braking activity, which would likely result in brake damage.
If the supplemental braking system is positioned too far back and doesn’t reach the brake pedal, most monitors
will indicate braking when the supplemental braking system activates, even though the brake pedal isn’t being
depressed. Every ROADMASTER monitor accurately indicates no braking, giving you the opportunity to reposition
your supplemental braking system — before you head down that six percent grade in the mountains.
ROADMASTER manufactures stop light switch kits for most popular towed vehicles; check online at www.roadmasterinc.com
for the most current list.
Stop light switch kits — 751XXX
33