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The plug is standard GM. Most parts stores have them for about $5. The red wire is connected to the 24v Positive Terminal block and is hot at all times. The brown wire is only hot when the key is on. It is controlled by the GEN2 relay, GEN2 diode, GEN2 light and bottom fuse.
The GEN2 light is...
M35A2 wo/w
a. Serial Number (VIN number) - 052510928
b. Registration Number - 04F56070
c. NSN without dashes - MISSING
d. Where you bought it - PRIVATE
e. Bumper numbers - NONE
The correct GM part number from the TM 9-2320-289-34P parts manual calls for the GM 459021 motor mount for both sides. However the mounting brackets are different for each side (normally not replaced)
The original poster was trying to say that all the listed numbers are for the correct item...
The GEN lights, both GEN1 and GEN2, are used by the alternator exciter circuits. If power isn't flowing thru the bulb the alternator will not excite.
For what ever reason GM wired the GEN1 exciter circuit and the heater to use the same fuse. When the fan is blowing it is robbing some juice from...
A previous post from Terracoma:
Use the GM part number from the Technical Manual, do not go with what is spec'd for the year/model.
Photo below shows the year/model mount (on the left) next to the correct mount, note the size difference.
GM 459021
NAPA 6021179
AutoZone 2292
Most of the USAF trucks did not come with the slave port.
http://www.steelsoldiers.com/showthread.php?18225-Late-Model-USAF-Contract-M35A2C-Spotters-Guide
The wire on the battery is the ground. Looks like all the juice was flowing thru it. That indicates that the frame to engine ground and Negative Terminal Buss to engine ground are messed up.
Have him check all the grounds...
The 1986 trucks did not have a factory neutral safety switch.
From you description, it may be a bad ignition switch. Over the years the grease inside the switches hardens and can cause issues.
Almost every CUCV that I have bought at auction has required a bunch of work to get road worthy. Not including tires I have usually spent close to $1000 to get them going. Of course some have been less and some more.
Welcome to the site.
Moved your post to its own thread.
What is the delivery date of your truck? It is on the data plate on the drivers door pillar. Makes a difference as to whether you have a neutral safety switch or not.