Fault Code Guide

Connecting to One Switch
With a Junction Block
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2. Disconnect the negative leads from the batteries
or, if the vehicle is equipped with a battery dis-
connect switch, turn the switch to the off position.
3. Locate the junction block attached to the frame
rail near the Chassis Module (CHM.) See Fig. 1.
4. Remove the capscrews that attach the junction
block cover to the junction block, and remove the
cover.
5. Locate the red wire in the junction block. The red
wire receives power from the output circuit of the
optional switch.
IMPORTANT: The power distribution module
(PDM) fuse supplying power to the optional
switch is rated for 15 amps. Do not exceed a
combined current load of 15 amps at the red
wire in the junction block.
6. Connect to the red wire in the junction block
using a #10 ring terminal. The optional switch
can provide 15 amps of fused battery power at
the red wire.
7. Using capscrews, attach the junction block cover
to the junction block.
8. Connect the batteries or turn the battery discon-
nect switch to the on position.
9. Verify the operation of the circuit(s) connected to
the red wire in the junction block. The optional
switch should control the electrical feature(s)
connected to the red wire.
10. Remove the chocks from the tires.
Connecting to One Switch
Without a Junction Block or
Multiple Switches
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2. Disconnect the negative leads from the batteries
or, if the vehicle is equipped with a battery dis-
connect switch, turn the switch to the off position.
3. Locate the customer connection end of the
optional-switch output circuit. The connection end
of the output circuit is located on the chassis be-
hind the cab. The circuit end is an exposed
blunt-cut wire sealed with heat shrink. There will
be a blunt-cut circuit for each optional switch.
See Fig. 2.
4. Use the identification label that is taped to the
blunt-cut end to properly match the correct circuit
with the corresponding optional switch.
NOTE: The following method of splicing the
optional-switch circuits to load circuits is ap-
proved by Freightliner. Use solder splice repair
kit ESY ES66 404, which works for 14 and 16
gauge wire.
5. Remove the heat shrink by cutting the optional-
switch circuit wire near the end of the heat
shrink.
6. Strip the insulation 3/8 to 1/2 inch (10 to 13 mm)
from the ends of the optional-switch circuit wire
and the wire for the load.
7. Place the three-inch (76-mm) length of heat
shrink from the repair kit over the circuit that is
being spliced to the optional-switch circuit.
8. Place the solder sleeve from the repair kit over
one of the stripped wires.
11/16/2005 f544657
1
2
3
1. Junction Block Cover
2. Junction Block
3. Chassis Module
Fig. 1, Junction Block
Optional Power Switches and Connection 54.39
Optional Switch Connections
Business Class M2 Workshop Manual, Supplement 10, September 2006 100/1