The Snakes Alive CMP Wiring Project

[Jacques Reed]

Good Day,

I have just redone my wiring from the ignition and fuel tank gauge switches in the course of redoing all my wiring. I redid did the light switch panel a couple weeks ago.

The interesting thing I discovered using an original harness for a pattern is the Autopulse wiring. Even though the Autopulse was only fitted to Indian delivered CMP trucks it appears the wiring for it has been fitted to the harness of at least one Australian Ford CMP also. Perhaps one size fits all by Ford.

As per attached photos:
Wire No. 45 is a jump from the ignition switch- out to the Autopulse switch in. When the ignition switch is thrown current to the resistor and the Autopulse input side flows.
No current flows to the Autopulse unless the Autopulse switch is also thrown. So you can run the engine without the Autopulse on but cannot run the Autopulse unless the ignition switch is on.
No. 46 wire is fitted to the main, and lower chassis harness also and terminates near the starter relay with the other tail, stop, and fuel tank sender wires.
No.16 and No. 45 doubled up at ignition switch to resistor and not at No. 30, ignition switch to gauges, as shown in Special Pattern Vehicles diagram. Not the first time diagrams and reality differ.
Again, all wires are 16 gauge except No. 21 which is 14 gauge.

Hope this is of some interest and have a safe and healthy Easter.

Cheers,

[Jordan Baker]

The wiring for the front marker lights, does it go directly to the junction block mounted on the inside of the nose or was there a separate junction closer to the light?

[Grant Bowker]

I don't recall ever seeing any evidence of an intermediate junction block and the diagram in section 2.605 of the parts book shows the sidelights with connectors to suit the central junction blocks. On the other hand, I don't remember seing light assemblies with long wires as replacements - maybe because so many were damaged by trees they were all "field expedient" repaired, extended or whatever... and none left for NOS sales?

[Phil Waterman]

Hi Jordan

I've encountered marker lights with long tails with spade ends long enough to reach the terminal strips up on top of the footwells both sides. Have also bought NOS marker lights with short wire tails about a foot with plug ends for inline connectors.

Cheers Phil

[David Dunlop]

Hi Jordan.

According to MB-C2, the two terminal strips either side of the cowl take headlight wiring only. The circuit diagram shows the two side lamps feeding directly to their switch on the dash. Whether that is a direct, long lead feed from both lamps to the switch, or shorter length leads that get the wire inside the cowl and then connect to fittings on the main cowl section of the wiring harness is unclear.

David

[Grant Bowker]

Agreed that the page in MB-C doesn't seem to show the markers going through the junction block but that doesn't make much sense to only make it easy to disconnect part of the wiring.

A reliable source shows a photo of an unmolested wiring harness removed from a known original vehicle and clearly shows wires in the main harness of the same (+/- a tiny bit) length to connect headlights and markers, all through the junction blocks. http://canadianmilitarypattern.com/R...arness%203.JPG

[Phil Waterman]

Originally Posted by Grant Bowker

Agreed that the page in MB-C doesn't seem to show the markers going through the junction block but that doesn't make much sense to only make it easy to disconnect part of the wiring.


A reliable source shows a photo of an unmolested wiring harness removed from a known original vehicle and clearly shows wires in the main harness of the same (+/- a tiny bit) length to connect headlights and markers, all through the junction blocks. http://canadianmilitarypattern.com/R...arness%203.JPG

Hi

Thanks Grant, I was in the process of digging out the same photo, that is the wiring from my 1945 HUP, I'll now try to find the photo of the 1942 C60S wiring harness.

But I suspect the difference is just evolution of CMPs they did make ongoing production changes in responses to reports back up through the maintenance channels. The logic I see to all the nose lights all coming to the same terminal blocks is it really annoying when you are pulling the nose off a CMP is to find you just ripped out a wire. It takes me 20 minutes to take the nose off Pattern 13 Cab which makes it a lot easier work on the engine. If you had to chase around and find all the connections it would take longer.

Cheers Phil