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AH, OK I am the one confused, nothing unusual about that :)

I am also interested as this is not the first time I have heard that. Where did you buy the turn signal switch?

The OP does not have a running compressor at this time so the pressures would be equal, of course it will not look that way because the gauges have different scales.

The power for the rear evap. and left cond. come from the other 30A breaker in the battery box,,, wire #720A, nothing to do with any of the 445(X) circuit at all.

Jump the low pressure switch and find out.

No 437 comes from the cond relay, follow the numbers, 436 controls the relay coming from the low pressure switch.

The gauges should read the same when "off" as the system will equalize.

Do you have a schematic of the rear evap? The first thing I would do is see if there is power at 720A at the rear evap, should be hot all the time.

The power for the left side cond fans gets its power from the rear evap, not the rear cond relay, follow 416A

If you can post the schematic you are using so we can all see the same thing.

If both sets of fans are powered by the same relay and you have power to one but not the other than you must have a wiring issue.

The buss bar will be the most covenant

Directly from the battery for power and ground is best, do not forget to fuse any lead you add.

Some times they do, but not in this case. I took the manufacture part number and let DuckDuck do the rest IIRC this is actually a "special" bolt having a reduced head (10mm) rather than the normal 12 or 13mm

This is what the part number crosses over to, the parts TM is a wonderful tool and can be downloaded for free... https://www.gmpartsdirect.com/oem-parts/gm-m8x1-25x20-multi-purpose-bolt-11515756

There are all the TMs you need to download for free. The links are listed in a sticky at the top of the forum, here is the link you need. https://www.nsnlookup.com/equipment-intelligence/land/hmmwv You should download the first 8 manuals, the manual you need at this time is TM-9-2320-280-24P-1...

What part numbers does the parts TM say goes there?

I have never heard of a transfer case being "locked" on a Humvee, but of course if it is on the interweb you can count on it being fact. It certainly would not be locked in neutral :LOL:

If it was grinding when the engine was running then the transfer case was trying to shift, sometimes it takes a little effort. Make sure the engine is off and the trans in neutral.

It would be very helpful if you would download and read the TMs provided here for free especially the -10 operator TM, One thing you will find is the vehicle transmission must be in neutral and the engine OFF to shift the transfer case. Otherwise you can cause damage to the drive train.