Gin pole stuff got delayed temporarily. Need electrical power to run the lathe and currently having problems with electric at the shop so had a few choices. Buy a generator, fix the Miller Big 40 diesel welder, move the welder to the crew cab's PTO, or setup a alternator welder onto the k5. Buying one isn't cheap, fixing the Miller could be quite expensive between engine work and maybe electrical, same with moving the miller to the wrecker. So setting up a alternator welder on the k5 it is.
Using an externally regulated alternator is the easiest way to do it since you don't have to tear open the alt and bypass the voltage regulator. Started off with a 13302N from a 90's era Dodge with the Cummins 12 valve. Little bit of plate steel, some pipe, 3 bolts and a belt.
There's 4 terminals on this alt model, and good luck finding a wiring diagram of them (not marked either). Through researching the external regulator on the Dodge truck manuals a friend found enough info for us to figure it out.
On the output side (these were obvious) there is the case ground which is where the phillips screw is, towards the bottom left of the rear housing. The positive output is on the bottom right and has it's own plastic housing.
There are 2 inputs at the top. One on the left that my finger is touching requires a ground (that's the odd one). One on the right, closer to the positive output post, requires a positive input.
Sitting at idle of about 600rpm, output of 31 volts and up to 130 amps available. Higher revs deliver more volts.
The output won't be wired into the truck and this alt won't have a input signal except when needed. Gotta make a little box for the 120v plug, welding leads, remote throttle control, and a switch to activate the alt when needed. There's a few companies that make kits for these, but I'm not throwing around $1000 into one of those kits.