100A Altenator Substitutes? (1 Viewer)

Joined
Mar 26, 2005
Messages
76
Location
SW Kansas
Story: My poor old cruiser's altenator gave up last saturday. Might have been the cold ( below 0F ), or that the belt tensioner was too tight (most probable ). The front bearing went out. It made lots of chunking sounds getting back to the house, but the case didn't crack. My Brother-in-law works for an altenator/magneto shop, and said that bearings are easy to replace, but.....later this spring I'm planning on putting an ARB winch bumper/8274 Combo. I figure the 55Amp stock altenator may not be up to the task.

Question: What 100Amp altenators(internaly regulated), would best fit the stock 2F altenator mounts, with as little modification as possible? IF a smaller/larger amp altenator would suit better, which one? I'd like to pick one up from the local yard, so Year/Make/ Model would be helpful.

BTW: This is the best board there is. Love the info here. I've been cruising now for 1-1/2 yrs now, and when I have a ?, I go here first. Thanks Guys......and gals.


'74 FJ-40
4 Wheel disk
2F (From '84 FJ-60 )
Mean Green Starter
SOA
 

LT

Joined
Apr 8, 2002
Messages
1,615
Location
Portland, OR
Use a flat piece of stock material with some ears to fit over the stock 2f alternator bracket. Then weld a couple of tabs ontop of the flat stock for the alternator. Make sure you use the pulley off of the 2f alternater on the newer gm stuff (the gm belts are smaller). I'de post a pic of my bracket but... it shows my propane set up that i'm doing a write up on :D
 
Joined
Aug 16, 2003
Messages
1,399
Location
granite falls WA.
hers a site that may have some info www.alternatorparts.com and if you go chevy go with an 84 camaro alternater, its a 12si unit and cools better, and has better bearings and internals then the old chevy 10si unit and is rated between 94 amps and 105 amps. mine is the 94 amp unit and at 1200 rpm's will put out around 55 amps. mine cost me $77.00 and some change with exchange.

good luck
frank
 
Joined
May 26, 2005
Messages
718
Location
Boulder Creek, CA
Hello,
I bought a 1 wire 160amp unit from this guy and when I had troubleshooting issues, he sent me a alternator on his dime. I would highly recommend this e-bay seller without reservation.
Ask him to wire you a 2 wire setup, the 1 wire requires a relatively large electrical load and high rpm to self excite. If you get the 2 wire its easy wire to battery, and wire to ign 12v source(coil ect). All you need is a mount, I did the swap and couldnt be happier, I can now run my lights, wipers, heater, and even the turnsignals without the entire system bogging down at low revs. Here is a link:http://cgi.ebay.com/ebaymotors/87-9...ewItemQQcategoryZ33573QQitemZ7926066648QQrdZ1er
eric
 

rusty_tlc

Dain Bramaged Member
Joined
Jun 23, 2005
Messages
14,094
Location
Reno, NV
With an 8274-50 you will need to supply 190 amps to winch a 2000# load, 275 to winch a 4000# load (So sez the Warn website). Better to get a higher amp hour battery (or better a dual battery system) than spend money on a higher amp alt.
A higher amp alt may help with recovery time on the batteries but AFAIK you usually only winch for short periods with a long time between, wich allows even a wimpy 40 Amp toyota alt to catch up.
 

Trollhole

THC
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Joined
Mar 6, 2005
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Mauldin, SC
Stock bracket works fine for my 12si. I had to use a spacer though.

IMG_4640.jpg
 

LT

Joined
Apr 8, 2002
Messages
1,615
Location
Portland, OR
Depending on which pulley you are using. I'm use the outer one, since my p/s runs on the inner pulley.
 

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