Early M715 "Distribution Box" Turn Signal Wiring
This information was obtained by checking an operational distribution box turn signal system on a 1968 M725. The distribution box is mounted on the firewall near the brake master cylinder. The schematic in the Organizational Maintenance Manual has the same lettering as the actual distribution box. The distribution box was mounted upside down in relation to the schematic.
I think it is best to consider the distribution box as part of the turn signal switch. If you look at it like that, there are only 6 wires that connect to the truck harness.
The wires on the distribution box are labeled with letter codes, not the actual circuit numbers. These are the wires with military circuit numbers.
|
letter code |
actual circuit number |
description |
|
A |
(460-461 or 467) |
power supply from the master light switch |
|
B |
(22) |
from stop light switch, via master light switch |
|
E |
(22-460) |
to right rear stop/turn bulb |
|
J |
(460) |
to right front turn bulb |
|
K |
(22-461) |
to left rear stop/turn bulb |
|
L |
(461) |
to left front turn bulb |
Here is a description of the wires that inter-connect the distribution box to the turn signal switch.
|
letter code |
description |
|
B |
grounded with short jumper to body |
|
C |
hot on right turn |
|
D |
hot on left or right turn |
|
E |
power from truck harness wire A |
|
F |
hot on left turn |
|
G |
flashes on left or right turn |