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The blower doesn't look like anything I've seen mounted on an M37. But that opinion is worth just what you paid for it. :unsure:
Could it be part of a larger assembly for the stock hot water heater? Otherwise, it's anyone's guess.
While I don't have a wire recommendation for you, I can offer some thoughts on my experience with similar issues.
My stock M37 had been under cover for most of its life. When beginning a rebuild last year, I discovered many problems with the wiring--most of it was age-related rot and cracking...