CMP's and attaching trailers......

[Patrice DEBUCQUOY]

Hi Alex,

Please find enclosed some infos given in HMSO's "Data Book of Wheeled Vehicles"

l8MxwAF.jpg
https://i.imgur.com/l8MxwAF.jpg

qn84NKv.jpg
https://i.imgur.com/qn84NKv.jpg

xmEuDpN.jpg
https://i.imgur.com/xmEuDpN.jpg

T57bCla.jpg
https://i.imgur.com/T57bCla.jpg

Hope it helps,
Patrice.

[Alex van de Wetering]

Guys, thanks for all your replies.

Tony, I had missed that thread. Interesting info.....especially the pictures that Grant posted of the bracket fitted below the hook. It looks to good to be make-shift if you ask me.....so that could be the proper bracket for lighting of an artillery light.

The Cnd 10cwt trailer came with tail and brake lights. There was a cable on the front with standard US male plug. However nothing on the CMP to plug it into.

Thanks Jordan. So, I am guessing the socket does fit in the connector in the back of a Jeep?

As to the safety chains I just cross them under lunet an hook them in the tow eyes on the frame ends of my C60S and C60L trucks.

Phil, that's also the only solution I could come up with.....I mean without fitting additional parts or modifying things. I can only imagine that towing heavy trailers can be a challenge!

From Patrice's scans I understand that the larger recovery tractors and trucks were fitted with proper brake facilities for the larger transporter trailers, but I still wonder about the 2 axle CMP trailers....the 20cwt single axle trailers, Jordan's 10cwt, but also US or British type trailers like the 1Ton Ben Hur and 1/4ton US jeep trailer.
They can be seen being towed behind CMP's in period pictures, so maybe if there was no standard connection for the lighting, they just didn't bother and drove without lights???

Alex

[Jordan Baker]

Yes the Cnd 10cwt trailer plugs into the socket on the rear of the jeep. The trailer is also fitted out with Ford brakes and a larger master cylinder. Same as used on the big Ford trucks of the time. If I have a load in the trailer and im towing it and stop, Ill feel my jeep brakes first then once the trailer starts to slow Ill feel the serge brakes come on. It tows very very well behind the MB. For being such a heavy trailer for its size, it is so well balanced and i can move it around empty or loaded by my self.

Im planning on having it pulled by my C15a at some. I'll be installing a spare trailer socket on the CMP for the lights.

[Grant Bowker]

On the 4 wheel trailers that look like they have CMP bodies, the lighter ones use hydraulic brakes actuated by the drawbar (similar setup to the 15 and 20 cwt CMP trailers).
My 15cwt CMP trailer came with a few scraps of wiring on it, enough that I believe one circuit would have been to both left and right and the other right only. The wiring stopped before the drawbar so I'm only guessing it was tail lights and brake light (hydraulic pressure switch in the master cylinder).

[Phil Waterman]

Hi All


The following photos are of the trailer electrical plug that was on the rear of my Pattern 12 C60L when I got it. As you can see from the pictures it was in pretty rough shape. I was wired into the main wiring harness of the truck so it is likely original. It has four contacts so I would a guess that they are:

1. Ground
2. Brake/Stop Light
3. Tail/Rear marker
4. Blackout tail

Pat 12 Trailer Plug.jpg C60L Trailer Plug_2272.jpg C60L Trailer Plug_2274.jpg C60L Trailer Plug_2275.jpg

Another thing to note is as this truck originally 16 inch rims the tow hitch is mounted between the frame rails, while my Pat 13 C60S has 20 rims and the tow hitch is slung under the frame rails. You really notice when you hitch a trailer up to these trucks. The Pat 12 C60L which now has 20 inch rims my generator trailer is tilled up a lot, while on the Pat 13 C60S the same trailer is towed dead level.

I was really surprised this morning went out to look for this to take a picture and it was on the shelf it should have been in correct box marked old Pat 12 parts.

Cheers Phil

[Lynn Eades]

Std QMC WWII USA plug, Phil (Jeep,Dodge, etc,etc....)
Post war common use, still there when the NATO plug was fitted. some NZ Army Land rovers had both.