7
Wiring instructions
continued from preceding page
Wiring the socket for a six-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 six-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 six-wire
electrical cord through the back of the protective boot and
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 13.
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 indentation 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 six wire cord, and connect the appropriate wires
to the new socket, according to Figure 13.
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
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 seven-wire system
1.
Use a test light at the motorhome socket to verify
that the terminals are conducting the electrical signals as
identified in Figure 14.
2.
Next, loosen the set screw and remove the terminal
assembly from the plug housing.
3.
Slide the included ½" clear vinyl spacer over the end
of the wiring, and pull it back six inches.
4.
Run the wiring through the housing. Connect the wires
according to Figure 15.
Disregard the color code printed on the back of the
plug; use the pin number-to-ROADMASTER wire color code
in Figure 15.
Tighten all the set screws, and check each wire to
ensure that it is secure. Apply a clear silicone sealant
Socket Pin
Motorhome/
Number
Towed Vehicle
1
.............
Ground
2
.............
Brake light (for
separate-to-
separate sys-
tems only)
3
.............
Taillight
4 .............
Charge line
(not used)
5
.............
Left turn/Brake
6
.............
Right turn/Brake
7
.............
Auxiliary
(not used)
front of
7-wire socket
Figure 14
around each wire entry and set screw indentation to help
weatherproof the socket and secure the set screws.
5.
Align the keyway at the top of the terminal assembly
to the housing key and insert the assembly back into the
housing. Push the clear vinyl spacer forward until it is flush
to the end of the housing, then tighten the strain relief screw
to secure the assembly. Tighten the set screw.
Wiring the socket for a seven-wire system
1.
If the motorhome does not have an electrical socket,
find a suitable location to install an electrical socket bracket
(optional) on the rear of the motorhome. 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
continued on next page
Socket
Pin
Roadmaster
Roadmaster
Motorhome/
Number
4-wire color
6-wire color
Towed Vehicle
1
................
White
..................
White
................
Ground
2
................
N/A
.....................
Red*
..................
Brake light
(for separate-
to-separate
systems only)
3
................
Black
..................
Brown
...............
Taillight
4 ................
N/A
.....................
N/A
....................
Charge line
(not used)
5
................
Yellow
.................
Yellow
...............
Left turn/Brake
6
................
Red
....................
Green
................
Right turn/Brake
7
................
N/A
.....................
Black*
...............
Auxiliary
(not used)
* Multiple applications — this wire may be used as an auxil-
iary circuit or a charge wire, or it may be used to power an
aftermarket supplemental braking system monitor or a lube
pump system, or it may not be used.
front of
7-wire plug
Figure 15
