Check this module in the PDP, this circuit breaker provides power for the hot air heater and defrost. If the breaker is tripped, the button will be up. Thanks to many folks that have helped so far with this diagnosis effort.
PTO is power take off, power for winch (if equipped), CTIS is power for central tire inflation. Look for abbreviations related to “defrost”, maybe DEF.
We are going to ask some active duty US Army contacts if they can provide insight into this circuit. This will take a day or so.
Welcome and greetings from the United States.
If you post any pictures, be sure any geotagging is turned off, don’t make the same mistakes as the mobiks.
Unfortunately we also do not have hard copies of the maintenance manuals for the A1P2 uparmored trucks, they are only electronic versions...
Ha that is the 1985 version of the TM, the caliper parking brake was just a twinkle in some AM General engineer's eye at that point, the page you pictured is the awful driveshaft parking brake that was in use 1984-89 ish. Find one of the later dated TMs on this site for info on the newer brake.
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