Roadmaster Sterling All Terrain, Owner'S Manual

Page: 8 / 16

6
WIRING INSTRUCTIONS
front of
4-wire plug
The Sterling All Terrain tow bar comes equipped with
a fully-wired motorhome-to-towed vehicle electrical cord —
simply plug the cord into the sockets on the motorhome and
the towed vehicle.
If you should need to rewire the plugs and sockets, follow
the instructions below.
Wiring the plug for a four-wire system
1. Insert the end of the electrical cord through one of the
cable guides.
2. Use a test light to identify the wires conducting the left
turn/stop, ground, right turn/stop and taillight signals. (If the
motorhome has a six- or seven-wire electrical system, the
other wires are not used.)
3. Strip ¼" to 3/8" of insulation from the ends. Connect
the wires according to Figure 10; apply a silicone sealant to
the attachment points to help prevent damage from moisture
and corrosion.
Wiring the socket for a four-wire system
1. If necessary, find a suitable location to install one of the
electrical socket brackets on the front of the towed vehicle,
in reach of the existing four-wire harness. The bracket must
be attached close to the center, and to a surface of sufficient
strength to hold it firmly in place.
Attach the mounting bracket close to the center of
the towed vehicle. If the bracket is attached too far to
either side, the bracket and the electrical socket may
be pulled away when the motorhome turns.
2. Strip ¼" to 3/8" of insulation from the ends of the wires.
Loosen the set screw at the back of the socket, and push
the inner connector out the front. Then run the four-wire
electrical cord through the back of the housing.
3. Loosen all of the set screws on the side of the socket,
and connect the wires to the back of the socket, as shown
in Figure 11.
4. Tighten all the set screws, and check each wire to
ensure that it is fastened securely. Apply a clear silicone
sealant around each wire entry and set screw indenta-
tion to help weatherproof the socket and secure the set
screws.
5. If the motorhome does not have the correct wiring
socket already, you can replace it with the new socket
for the four-wire cord, and connect the appropriate wires
to the new socket, according to Figure 11.
6. Connect the four-wire electrical cord to the motorhome
and towed vehicle. Test the towed vehicle’s turn signals,
tail lights and brake lights to ensure they operate in con-
junction with those of the motorhome.
If the plugs and sockets are not properly wired, the
electrical connection will not function, and the towed
vehicle’s turn signals and brake lights will not mimic
those of the motorhome. Drivers behind the towed
Figure 10
Socket Pin Motorhome/
Number Towed Vehicle
1 ............. Left turn/stop
2 ............. Ground
3 ............. Right turn/stop
4 ............. Taillight
front of
4-wire socket
Figure 11
front of
6-wire plug
Figure 12
vehicle will not be alerted by turn signals or brake
lights, which may result in a traffic accident, causing
property damage, personal injury or even death.
Wiring the plug for a six-wire system
1. Insert the end of the electrical cord through one of the
cable guides.
2. Use a test light to identify the wires conducting the
brake, right turn, taillight, ground and left turn signals.
3. Strip ¼" to 3/8" of insulation from the ends. Connect the
wires according to Figure 12; apply a silicone sealant to the
attachment points to help prevent damage from moistureand
corrosion.
continued on next page
Socket Pin Roadmaster Motorhome/
Number 4-wire color Towed Vehicle
1 .......... Yellow ............. Left turn/stop
2 .......... White .............. Ground
3 .......... Red ................. Right turn/stop
4 .......... Black ............... Taillight
Socket Pin Motorhome/
Number Towed Vehicle
1 ............. Ground
2 ............. Auxiliary
3 ............. Left turn
4 ............. Taillight
5 ............. Brake light
6 ............. Right turn
front of
6-wire socket
Figure 13
plug
plug
Socket Pin Roadmaster Motorhome/
Number 6-wire color Towed Vehicle
1 ........... White .............. Ground
2 ........... Black ............... Auxiliary
3 ........... Yellow ............. Left turn
4 ........... Brown .............. Taillight
5 ........... Red ................. Brake light
6 ........... Green .............. Right turn