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Anybody have any experience here with the 100 amp system or the more modern 150 amp alternator?
I want to install a GRC 106 radio and need much more than the 25amps I get from the generator/regulator.

Will an M151 60amp alternator fit the older Mseries bracket?
If I get an alternator, could I jsut leave the regulator inplace (minus the generator and cable) to provide power to the ignition /lighting system, or does it need to be taken out and the plug shorted to provide power into the dash area?

Wes Knettle should be able to help you with some of this. He has copies of many electrical manuals for military vehicles.

The GRC-106 uses a max of 40 amps in transmit. Therefore any of the larger military systems would work.

The 60 amp alternator found on the M151 will fit the bracket and would only require mating it's wires to the harness above the regulator and using a volt meter. Plus of course the switch to a 3 belt system.

The 100 amp found in the M38A1's TB 9-8015-2 Chg 3 is spendy at about $1000 and a lot of work to install.

Any civvy 24 volt 60 to 100 amp alternator will do the job. The GM's and Nippondenso's would be the best bet. The mount is easily modified for them and pulleys can be had as well.

Is there any info on the more modern military 150 amp alternator for the M series jeeps and 3/4 ton trucks, part number PU-656/M.

I've only seen the Leece-Neville's up to 100 amp. The M151 100 amp optional kit uses one with a seperate 100 amp voltage regulator and three groove pulleys. The 150 amp military was used in the late 60's USMC MRC-83 installations into M38A1's. Have you looked at this site:
http://www.hypertools.com/mrc83.html








http://www.hypertools.com/mrc83.html

I have a 100 amp kit for an M38A1. It uses a four groove pulley setup, and the regulator box is on the firewall on the left side. The rectifier stacks mount behind the grille in front of the radiator, and everything is tied together with huge cables. Wes is right, they are expensive.

Your best bet is to just get a 60 amp alternator from one of the M151 suppliers. Most of them sell tested takeouts for a reasonable price, and it will physically mount in place of your 25 amp generator. Get a conversion harness from Front Line Military Vehicles, and it will plug into your stock harness. Two wires go to the alternator, one to the starter terminal, and one goes to the ignition terminal of the ignition switch for switch-on signal. I run mine with only two belts, and it is adequate for most everything. On an A1, you'll have to remove the front belt groove on the pulley to clear the fan shroud or trim the shroud. Let me know if you go this route and need help, and I will send pics of the installation.