Electronic Voltage Regulator

[dpcd67]

Will an electronic voltage regulator fit M38? I read that the ammeter no longer works. I hate electrical things. Best if someone tells me what to do. I now have a Prestolite regulator on my M38, from which all the pins have been removed. So, I guess I need some sort of new regulator and the old types seem to be non existent.
In some research, I found some using a commercial 24 volt one wire alternator; looks a bit civvy but I might cave in in the interim as they are very cheap. I do know I can use a military alternator from an M35A3 but those things are $600 and up so that ain't going to happen.

[Joe Gopan]

All you have to do is install a 5 Wire Spider for the #27 Circuit and connect the 5th #27 Wire to the terminal on the Batt/Gen Indicator.#27 powers the instruments. and tape off the two original wires that went to the ammeter.

The GI Issue 24 Volt/25 Amp Solid State Regulator was introduced to the M-Series trucks around the early 60's. They are a lot easier on the batteries due to their precise output.

[skyjeep50]

I have voltmeters in both my 24v M38 and M38A1. I had an ammeter failure in the A1 which let a charging system problem go undiscovered. The M38 has an electronic voltage regulator - got one on Ebay for about $60. Was a little scuffed up but it works just fine.

[dpcd67]

Thanks; good advice. I had one on an M37 I had 2 years ago, but it was already on it from a Govt rebuild truck and I didn't care how it was wired up. Anyway, I see them selling for $200, but if you see one for less, let me know.
thanks. I saw a 5 wire spider harness for sale somewhere recently.....

[skyjeep50]

Midwest Military has them as does many other parts suppliers.

[Joe Gopan]

Don't forget to specify Packard or Douglas for the type connectors on the spider.

[dpcd67]

Yes on the spider. And yes on the regulators being available but I never pay full retail.maybe as a last resort.
Thanks for the tips.