Tools required:
Multimeter
Socket Set
Hammer (Dead Blow preferred for gently knocking things around)
Service/Shop Manual
Lube (for bearings/bushings)
Growler (optional)

In waking one of my fleet for the season, I found that the charging system wasn't charging. I didn't immediately stoop to 12V or Alternator conversion antics.

I validated no voltage/current between ARM and Ground with my multimeter. I then re-polarized the generator, and the still re-verified no electricity flow between ARM and Ground. I shorted Field and and ARM at the generator, and again checked for electricity flow between ARM and Ground. Nothing. Definitely the generator that is wrong. Used the simple tools to remove the generator from the truck. Performed all applicable tests in the service manual and found the armature at fault. Disassembled the generator with the basic tools. Verified diagnosis with a growler (not required, I just happened to have one to verify it). Obtained, tested, and installed a replacement armature assembly. Included a new common off the shelf Timken bearing (because I was in there). Re-used existing brushes and bushing (much life left, good even wear pattern), and lubed accordingly. Installed the reassembled generator and polarized it. Repair verified as charging system indicated charging as expected.

No advanced tools or skills required. Just basic tools and the ability to read and follow a service manual.

 

I recently had the same problem. There was a very good Youtube video I followed to diagnosed the problem. Used the basic tools to remove the generator from the truck. I then went a different route from there. I used one simple tool, the ignition key for my daily driver and took the generator to a local rebuilder and had him go through it. After he checked it out and replaced the front bearing, cleaned up the armature, replaced the the end plate with new brushes and bushing . Cleaned the housing inside and out and assembled it. I then had to use my wallet to exchange $200 for my rebuilt generator. I used to help my dad rebuild generators and starters 50 years ago in his repair shop. I still have his growler and armature lathe and a assortment of bushings but it's been 50 years since I completely rebuilt a generator to starter. I've piece together generators and starters in the recent past using used generators and starters I have on the shelf but this time I didn't want to screw around with doing it myself and I wanted to make sure whatever was worn or about the fail be replaced with new. I have other things to do and left it to an expert I trust to do it.

 

An inspiring story for sure. One that’s also comically the polar opposite of my 6 v generator story. I won’t go into embarrassing details here. Suffice it to say that I now own 4 fully restored show quality examples of these bad boys. All done by Steve Blancard who’s a 6 v generator genius. My charging system woes took a just about three days of head scratching from a mechanic with 40 years of ford v8 expertise to get to the bottom of back in 2023.

After putting in a newly rebuilt flathead from H&H in 2023, and then taking out every “modern” replacement engine accessory he had on there was exactly where my decent into hell began. Because I’ll tell you one thing I haven’t had one thing that didn’t have be done two or three times until I found the right person to rebuild all the original parts that i personally wanted on the engine.

It’s no wonder why a shop like H&H uses these relatively reliable products like power master generators, Petronix ignition, and high torque mini starters as well as brand new Stromberg carburetors on 75 plus year old engines . Their engine rebuild was flawless, but I’ve been down each and every road with badly rebuilt Starters, Voltage Regulators, Generators, Carburetors, and Distributors! The fuel pump and carburetor I run are the common reproductions, look very similar to originals and work very well.

However I find learning about all of this the best part. It’s why I bought this truck 6-7 years ago. Back then I knew nothing, now I know next to nothing, but I always enjoy reading your posts BMoran! You’re an invaluable resource on this forum and an inspiration to me!