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Yes you should use the same 24V feed for both functions, switched (run) or unswitched, of course it should be fused

Curious was the panel specified for 24V?

Use a DPDT switch

I can fix that, be back in a minute

That is awesome, what did that panel cost? My main problem with custom stuff like that is I am always wandering around with ideas so it would be difficult to settle on a design.

Actually this can be simply done with a SPDT switch, just cut the wire on the light side of the shifter switch and bring both sides to the switch. Or break the reverse light wire anywhere along its path, same thing. This will prevent back feeding the run circuit.

The only caveat is that if you put the trans in reverse while you have the lights in by-pass and the run switch off it will try to back feed the run circuit. This would seem to be a very rare occurrence as you are not likely to put the trans in reverse without the truck running. There are two...

Simply wire 24V through the switch to the lights, could not be easier Did you say you made that panel? if so nice work!!!

Sometimes you are the windshield and other times you are the bug :(

I asked you in post #32 to start another thread, that is why I said again. But to answer your question that is an IP for a 6.5L with a 3 speed transmission, you could remove the plastic cam and use it on a 6.5L with a 4 speed but unless you got a super good deal on it you should return it and...

Welcome to the SS forums!!!

That would be DB2831-6278 AGAIN, start a new thread. it is not polite to hijack someone else's thread.

Welcome to the SS forums, there are many here willing to help. Please start a new thread on this subject as it has nothing to do with this threads subject matter.

In fact it is easy to see even without a schematic that the glow plug power goes in and out of the circuit board using the green and white wires secured to the circuit board with studs as pointed out by the arrows. They evidently needed some amount of voltage drop in that circuit, that is why...

You need to check the schematics again, that solenoid does not power the glow plugs it is intended to be closed all the time when the run switch is in the run position so supplying an output all the time would be normal, in fact the blower and alt will/would not work otherwise.

One small example of what you will find in the -10 operators manual is that when you turn the run switch to off you must wait at least 90 seconds before switching back to run or you can damage the glow plug system including the VERY expensive PCB/EESS box. Also you should start your own thread...

Welcome to the SS forums. You need to be much more specific as there are many different types of "cooling lines" on a HMMWV. The best thing to do is download the applicable TMs from here. https://www.nsnlookup.com/equipment-intelligence/land/hmmwv The first 8 or so cover 90% of the HMMWVs out...

That solenoid has nothing to do with the glow plugs, the fact that the glow plugs seemed to work is only a coincidence. No I would not leave the circuit board, why would you want to?

To rebuild the box to be manual you must strip the circuit board completely out and add another solenoid

The large solenoid in the box controls the blower and the alt NOT the glow plugs, the glow plugs are powered by the CMOS devices on the board, so you are not controlling the glow plugs, All you have done is effectively disabled the heater blower and the alt.