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No complaints AFAIK, Chris (steelsoldiers) is the person to ask, he installed it on his M925.

Circuit diagram attached...

Sure, just have to dig it up...

Chris (steelsoldiers) will be testing a "bare bones" version of the control box over the weekend. It was put together by yours truly and the printed circuit board has been eliminated, which simply means that the "protective" features based on the "engine running" input (wire #566) are no...

Here is a typical schematic of a "normally open" relay/contactor. The coil may have a resistance of 100 ohms or so, the contact resistance must be measured when the relay is energized... Edit: Based on the link posted by Chris, there may be some issues with the electronics since the designers...

Closed contacts (relay energized) should give you a reading of 1/2 Ohm or less for a new relay. To help "burn off" some of the oxide on the contacts of the reverse polarity protection relay, turn on headlights and other electrical loads before flipping the master switch. Note: When removing...

Appreciate the pictures, I'll get back to you.

Like I have posted before, the reverse polarity protection relay (the one with a diode in the coil circuit) is switched without a load the moment the master switch is turned on, which means that its contacts will build up an non-conducting oxide over time. Power relays are supposed to switch a...

Excellent final touch! Venting is important unless the box is filled with an inert gas... It's funny how the manufacturer gets away with using "Radio Shack" parts when the box is welded or encapsulated.

Here is a better view of the circuit diagram. Couldn't edit the above post for image....

The control box houses two 50-amp relays, the first click you hear should be from the one that prevents damage from a reverse polarity condition. That relay will only energize if the polarity is correct (a diode in the coil circuit does it). Power relays like to switch "live" loads, the always...