How To: C15a Wire-3 restoration

[Jordan Baker]

Grant,

Yes it’s an off the shelf item from Vintage Wiring Harness in Australia. Item number CV425. I had them add the separate wires for turn signals as well. The quality is great and I’m very happy with it. All of the leads are tagged, however the numbers don’t match up to the wiring diagram in the C15a manuals. Saying this they may have used a different wiring diagram and matched it to them. One other thing I have noticed is that you have to provide your own light sockets for the dash lights. If I come across anything else I post about it. Ignore the box as it is only being used for holding CMP goodies such as side lights and other original bits.

The stainless braiding came from https://www.cabletiesandmore.com/sta...aided-sleeving. I ordered online and it arrived by the end of the next day via UPS.

I went with stainless as the tinned copper was a lot more. The other advantage was that the stainless had a good expansion range. So using the 1/2” stainless, I was able to do all the sizes as found on the main harness.

Thanks Phil. I look forward to seeing what you’ve got in your files. I’ve got what I believe to be an original rear harness. I’ll have to slip under the truck and see how it goes then compare to the new made one. I do know the new one is way longer then needed for a 15cwt.

[Jordan Baker]

Started installing the front harness today. It was quite the job getting the dash wires to feed through the hole. Eventually everything got pushed and pulled through. I also started securing the harness to the cab frame with some clips. I’m so glad I went the extra and put the metal shielding on everything. It looks just like how the original should.

In my last photo showing the various holes. What are they all for? I know the top one is for the main wiring harness. Does anyone have any documents on what goes where?

[Grant Bowker]

The oval hole gets a rubber grommet with 4 holes in it that cushions the temperature line, choke cable, throttle cable and oil pressure line. the two smaller round holes above and below the oval are for bolts securing the tin that holds the grommet.
One vendor is Steele Rubber https://www.steelerubber.com/firewal...met-60-0010-45 Other vendors sell it too, Steele just had a clearer photo than Chevs of the 40s....

[Jordan Baker]

Thanks Grant. I should have said that I have the rubber bushing. Any idea on the other two larger holes? I’m guessing the speedometer cable goes in one of them.

[David Dunlop]

Jordan.

Would the vacuume lines for the wipers occupy one of them?

David

[Phil Waterman]

Hi Jordan

Your truck has one more hole comin in from the engine compartment than I've seen before, wonder if it was drilled to replace a wire or possibly for a replacement temperature gauge tube.

Here is same area on my HUP
Small Web 2012 HUP June 029.jpg

As you have discovered the only practical way to work on the dash and engine compartment wiring is with nose off. I make this comment to anyone planning to replace or do major work on the wiring in this area.

Jordan though I'll guess you have looked at the section on wiring on my web page, here is the link for people getting into wiring on thier CMPs http://canadianmilitarypattern.com/C...formatioSn.htm I've included the link instead of posting over all the photos because you can punch down to much higher resolution than is practical on MLU.

Cheers Phil

PS In response to Davids comment on vacuum line, the vacuum line for the wipers on mine goes up through the center post on the windshield.

[Jordan Baker]

Hi David.

As Phil says the vacuum line goes up through the top between the main windshield frame.

Phil, yes I have been checking out your photos from your website quite a bit the past few days.