Part number for alternator on m923

[Cobra2401]

Hi. I'm trying to find the part number for my alternator on a 1985 m923 5ton truck. It won't charge my batteries. They're brand new. If anyone has the part number I would appreciate it. Thanks

 

[emmado22]

Same 60 amp generator in the M998, M35A2, M800 series, M900 series and a bunch of others. Shop around.

 

[doghead]

In the -20PTM or -34PTM.

 

[doghead]

Have you tested/diagnosed it, as per the -TM?

Sure would suck to change it if it is not the problem.

 

[Cobra2401]

I'm currently charging the batteries. Once they're all charged I was gonna test the alternator. I just wanted to find the alternator locally incase it needs to be replaced

 

[doghead]

A stock alt is not something you usually find locally.

 

[Cobra2401]

I heard napa carries the alternator. Don't mean they have it on the shelf. Even if they have to order it. Etc. I just wanna have it ready....so I know where I can get it from. The batteries I just got brand new last summer. Just recently they stopped holding a charge. Don't know what else it could be, besides the alternator.

 

[emmado22]

Get it rebuilt. Good luck finding one locally...

 

[doghead]

There is a data plate on the alt. It should have the manufacturer and part number.

 

[Cobra2401]

Yeah. I was gonna call around tomorrow. You know off hand if it could be anything else? Besides the alternator? Thanks again

 

[doghead]

Follow the TM troubleshooting, it could be as simple as a bad ignition switch.

 

[Cobra2401]

Yeah. I saw the data plate. I called around a few places. Know body knew what I was talking about

 

[Cobra2401]

Where do I find the TM for this truck

 

[doghead]

In the Tech Manual section, top header bar.

You have a M939 series truck.

 

[Cobra2401]

Yeah. I have the m939 thanks. I'll take a look