M35A3 alternator NAPA cross reference

[JonMolander]

I need to replace the alternator on a 1993 M35A3 (Cat 3116 engine). I have found a few NOS or rebuilt online for $470-$800. Does NAPA have a compatible 24V alternative?

Cheapest I've found so far: http://www.eriksmilitarysurplus.com/alformve24vo.html

Thanks in advance.

 

[welldigger]

If I were you I would contact tmamerica and get his bracket kit to convert to a civilian delco 27si alternater. Brackets and alternater together will be half or less than half of a n.o.s. military alternater.

That and if it ever dies any local starter and alternater shop can rebuild it....CHEAP.

 

[trukhead]

I used this alternator: http://www.spidermarine.com/inventory/104834-100-new-delco-24-volt-70-amp-alternator
with this pulley: http://store.alternatorparts.com/partno241751.aspx

That part number cross referenced with a pulley spider had and I bought it from them and they installed it before they shipped the alternator.

I fabbed up the bracket to mount this alternator using the original length belt already on the engine.

I used a move the upper bracket to locate the alternator as well.

I posted a few pictures of my M35A3 during the bracket build.

 

[JonMolander]

Hey guys, thanks for the reply! I went ahead and found a local alternator repair guy. He immediately told me he couldn't/wouldn't work on my massive paperweight before I even set it on the countertop. But he offered an idea to convert to a civilian type. He gave me the exact delco 21S and pulley you mentioned, trukhead. I sawzalled off the welded bracket nuts and bought new hardware to include a 1" long steel spacer.

I found a NOS alternator on eBay for $800. Erik's wants $470 for a rebuild. Civilian conversion was $219. I win!

Alternator: $187
Pulley: $ 21
Hardware: $ 11
______________
$219

 

[rustystud]

Looking good ! and with the money saved you can buy a spare !

 

[trukhead]

Ya, your setup looks good. I meant to say the pictures of my setup were in my profile photo album. The one wire setup is easy to wire.

 

[Hoefler]

Looks good. I will go this route when mine fails.
Pete

 

[greg2560]

I used this alternator: http://www.spidermarine.com/inventory/104834-100-new-delco-24-volt-70-amp-alternator
with this pulley: http://store.alternatorparts.com/partno241751.aspx

That part number cross referenced with a pulley spider had and I bought it from them and they installed it before they shipped the alternator.

I fabbed up the bracket to mount this alternator using the original length belt already on the engine.

I used a move the upper bracket to locate the alternator as well.

I posted a few pictures of my M35A3 during the bracket build.

looks like a delco with a 24v reg installed

 

[brn24wheel]

Hey guys, thanks for the reply! I went ahead and found a local alternator repair guy. He immediately told me he couldn't/wouldn't work on my massive paperweight before I even set it on the countertop. But he offered an idea to convert to a civilian type. He gave me the exact delco 21S and pulley you mentioned, trukhead. I sawzalled off the welded bracket nuts and bought new hardware to include a 1" long steel spacer.

I found a NOS alternator on eBay for $800. Erik's wants $470 for a rebuild. Civilian conversion was $219. I win!

Alternator: $187
Pulley: $ 21
Hardware: $ 11
______________
$219
View attachment 522250View attachment 522249View attachment 522251

Do you have any pictures of how you wired this? I'm about to do the same install this weekend.

 

[cattlerepairman]

If the issue is output (voltage too high or too low) then it might just be the voltage regulator that sits in the "end cap" of the alternator. Cap plus regulator replace for about $80.

You would be looking for P/N SAW-10799130 or NSN 2920-01-079-9130, if your alternator is the usual 60A NSN 2920-00-909-2483

If the alternator is seized or has bearing whine, its a different story.

 

[Monkeyboyarmy]

I would be interested in the old one if you want to get rid of it.