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There have been a number of times I have found M37's (same fuel and electrical as M43) stranded on a high Colorado mountain peak thinking they were vapor locked. In fact they had their gas cap's screwed all the way tight not allowing any air to the fuel tank. The Fording Systems had a pull cable...

I don't know if the electronic regulator is adjustable, but the old contact style is adjustable. How long does the voltage at the batteries hang around 27/28 volts? This is 13.5 to 14 volts per battery and what might be expected just after the engine starts running. After a few minutes, the...

A quick comment about the vent/cooling lines. Since the system is under water, the distributor is sealed from ambient and depends on the vent/cooling lines attached to the carb air horn. The major purpose of the lines is to sweep the air across the points plates and around the coil. Fresh air as...

Zak's photos are interesting. I have never seen the extra resistor button before. I checked the ORD number on the coil and it comes up as a coil for a Jeep 715. I know the Dodge M37/M43 distributors are very similar and I suppose the coils will interchange. In fact I think the only real...

I rechecked My TM and ORD manuals again (dated May 1955 and January of 1954) and there is no mention or listing for an external resistor. Same result for the 1960 edition of TM 9-2320-212-20P. TM 9-8031-2 issued May of 1953 does not cover the distributor. While I have never encountred an...

TGP (IL) mentioned the air tubes and that does make a large difference on how hot the coil get while running. These coils are incased in a sealed distributor system and the distributor has a vent system that pull air across the coil to cool it. I have seen an M37 with the vent system capped off...

A quick diagnostic check can be performed by measuring the voltage across the series battery pack with a volt or multi meter of some kind. At rest (engine not running and all accessories off) the voltage should be something over 24 (25 or so) While observing the volt meter, have someone start...