KC-599

4/29/22, 10:51 AM
Article
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V-MAC III - Trailer Receptacle Auxiliary Power
Wiring
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Internal Content
This script applies only to V-MAC III chassis built with the original EPDM
(1997-2000), prior the introduction of the 5A ABS ECU fuse into the EDPM
and the replacement of the Deutsch connectors by Packard connectors
on the EPDM pig tail harnesses. Tie-in dates for the new EPDM are
approximately August 2000 for CH & CX and December 2000 for
Macungie products. Using the script below on chassis equipped with the
new EPDM is forbidden, because now the ABS will be powered by the
center pin of the J560 plug, in anticipation of PLC4Truck ABS ECU.
1. INTRODUCTION
Service Engineering has received many calls requesting a means to
power the center pin of the trailer cord receptacle with battery power
from a dash mounted switch. There is an unpublished main cab wiring
option, which uncouples the trailer ABS circuit and couples a dash
switched (toggle switch) battery power circuit to the center pin of the
J560 trailer cable receptacle when the park brakes are engaged. This
option has been used to power the Sculley for Tankers.
2. ARRANGEMENTS
This unpublished option includes four arrangements that include:
1.) 74MTA712P13 (GA PNL D);
2.) 16MRA716 (Press Sensing SW);
3.) 8MR51303 (Wiring Diagram Option).
4.) 44MRA7123 or 44MRA7123P2 (44MRS5182, Cab Wiring).
3. PARTS
The parts breakdown for the arrangements is as follows:
Quanity
Part Number
Description
1
2MR2136M
41MR4644M
48 RU2313
Relay (Trailer Power Relay)
Harness Cab Option
Band Clamp
83AM5000
Screw
1
UI
; Live 10
1
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1
598AX193
Plug
1
980AX46
1MR2414
Socket
Pressure Switch (Auxiliary Park Brake)
1
63AX3660
1MR3410-P3
4MR3290M
63AXT33A, Tee Pipe Fitting
Toggle Switch (D Panel)
Switch Name Plate
1
44MRS5182
System Drawing
2
2
1
4. GENERAL INSTALLATION INSTRUCTIONS
4.1 Install the optional harness behind the dash and through the
bulkhead. See arrangement diagram 44MRS5182;
4.2 Attach the positive ring terminal of the harness to the power stud at
the electrical equipment panel and the negative ring terminal to the right
cab ground bolt;
4.3 Attach the trailer power relay to the connector on the harness and
secure the relay to the electrical equipment panel bracket.
4.4 Install the tee pipe fitting into the switches manifold (air). See the
arrangement drawing 44MRS5182.
4.5 Install the air switches on the tee pipe fitting, Then, attach the
harness connectors to the air switches.
4.6 Remove the D panel. Then, attach the harness connector to the
trailer power switch and install the switch name plate and switch to the D
Panel. Install the D panel.
4.7 Remove the 39-B-50 wire and terminal from the trailer junction block
(terminal 7) and attach it to the harness connector 39-C-5.0 (39-B-5.0).
Then, connect the harness ring terminals
39-D-5.0 (39-C-5.0) and 11-D-2.0 to the trailer junction block terminal 7.
4.8 The installation is complete. Test the system by setting the park
brakes, cycle the key off, and turning the trailer cord center pin dash
switch on. In this condition, the center pin if the J560 trailer cord should
be hot. If you release the brakes, the circuit will go dead. Good luck!
Note:This script was developed for threat fittings. Push-in fittings require
different P/N for pressure switch (1MR3583) and Tee pipe fitting
; Live UI
(63AX3882).
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