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The control boxes are generally shown with a wiring error, it should be as corrected in the diagram below. It doesn't matter if the control box is used for the coolant heater or personnel heater, the correction applies to both.

This is the wiring diagram for it as it's hooked up complete with control box and fuel pump (as used in the XM757). If the resolution isn't good enough, send me your email addy and I'll get a full size scan to you.

You will also need an interconnecting cable, fuel pump and fuel filter. The information in the images below should be sufficient for you to make your own cable and control box. The control box and cable are the same for all, so overlook the fact that it is for a "coolant" heater in the diagram...

That would be SW model 10530A24.....

Now you tell me. :-)

The control box in an exploded view. The circuit breaker is rated 15 amps. Wiring per diagram above. The control box circuitry is grounded via its metal case and the separate "24 volt" wire goes to the positive battery terminal, it supplies power to the heater and control box.

Here is the wiring diagram. It is "typical" and may have some slight variations from vehicle to vehicle, this one for the M656 8x8. Edit: The numbering of the connector pins correspond to the marking on the connectors, "A", "B", "C" etc.

Okay, one step at a time, here is the cable, get the connectors from any number of suppliers, Newark, Allied etc. Start reading the catalog pages and you'll figure out how the numbering system works. Along with the connector comes the clamp part also. I like to call the connectors "MS" types...

Those parts are kind of hard to find, I search for them from time to time just in case...mostly on eBay. If you need a wiring diagram and part numbers for the wiring harness/connectors, let me know. That item can be made from scratch. The control box too, if you are not particular about...