The numbering system on smps is standardized. For instance, a headlight will always be 17, 18 and 91.
I had a look online at an American m37 wiring diagram, and the difference i can see mostly relates to the us use of the older style turn signal box from the 60s. In canadian service, the m37 would have just used a signal stat commercial signal arm with a 24v flasher and pilot lamp. I suspect the wiring diagram online would be for the m37b1.
One minor difference between the us and cdn trucks is the extra wire under the dash for the 24v dc outlet on the dash.
I rewired an m37 a couple years ago using one of the new old stock m37 wiring harnesses from John bizal. It covered the dash area as well as under the hood up to the headlight connections and to the connections under the right side going to the master cylinder and taillights.
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