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Can you do this with the alternator?

Discussion in '80-Series Tech' started by nyk438, Feb 5, 2004.

  1. nyk438

    nyk438 Guest

    I read at cruiserpages.com that you can swap a GM alternator into my LC...it was done in a 40 but would it work in my 80?

    heres the description




    HOW TO INSTALL A GM ALTERNATOR IN A LAND CRUISER

    There are several reasons why you might want to install a GM alternator into your Land Cruiser.

    You are installing a Chevy V8 in your Land Cruiser.

    Your stock alternator has gone bad and you want a cheeper alternative.

    You are planning to run hi-amp accessories that the stock alternator will not be able to handle like a winch or lights.
    I did some testing of the stock alternator in my 79 FJ40 and it only puts out about 25amps. I started reading the Toyota manual and found that the alternator was only rated at 30+ amps! This was not going to work with my new winch. I opted to have a custom GM internally regulated alternator built by a local shop. It is a stock GM case that has been internally reworked to produce 130 amps. The cost of this alternator was still less than a stock Toyota replacement part.


    Installing the GM alternator
    First note that the GM alternator has three electrical connections labeled Bat, #1, and #2. (I'm assuming that you are using an internally regulated alternator vs the externally regulated stock Toyota alternator.)


    Attach the LARGE WHITE WITH BLUE STRIPE Toyota wire that was attched to the back of the Toyota alternator to the Bat terminal of the GM alternator. This is the charge wire. As a note: If you have upgraded to a high output GM alternator, this wire may be undersized and you should increase the current carrying capacity of this wire.

    Now make a 4" jumper wire with a ring terminal on one end and a female spade terminal on the other. Attach this wire between the Bat and #1 terminals of the GM alternator.

    Disconnect the Toyota regulator which is usually located on the firewall below the clutch master cylinder. The Toyota regulator will no longer be needed since you are using an internally regulated alternator.

    The last wire you need to attach is the ignition switch wire. The BLACK WITH YELLOW STRIPE WIRE disconnected from the Toyota regulator is a fused ignition switch feed wire. This wire will need to be attched to the GM alternator #2 terminal. Run a new wire from this BLACK WITH YELLOW STRIPE WIRE to the #2 terminal on the GM alternator OR you can connect the BLACK WITH YELLOW STRIPE WIRE from the regulator to the WHITE WITH GREEN STRIPE WIRE from the Toyota regulator together and then connect the WHITE WITH GREEN STRIPE WIRE to the #2 terminal on the GM alternator.

    To verify everything is working: With the engine off, connect a volt meter across the battery terminals. You should read about 12.5 volts on a fully charged battery. Now start the engine and watch the volt meter. It should increase to just above 13 volts. If you have installed a high output alternator it may be necessary to increase the engine RPM to see the voltage increase. (Generally, high output alternators will begin charging at a higher RPM due to the high output design. A higher RPM is necessary to produce the higher output and the lower (idle) RPM may not produce enough current and voltage to show up on the meter at the battery. One way (or trick) to compensate for this is to decrease the size of the alternator pully which will increase the alternator RPM. In fact, on many standard alternators you can do this to produce a 'high output alternator'.)
     
  2. Landpimp

    Landpimp

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    I can't think of any good reason it wouldn't work, mounting will not the same as a 40, wiring will be different but I imagine it could all be made to work......with some mods of course. Mean Green sells a 150 amp alt for the 88-92 which is not much more than a GM alt......maybe in a new casting......so its doable.....I think
     
  3. Cruiserdrew

    Cruiserdrew SILVER Star

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    Nick-Here is a better idea. Did you in fact trash the alternator in the mud bath you gave the cruiser? Cruiserparts.net has an alternator from a '91 for $100. Don't mess around and booger rig your cruiser or you'll end up with crap. Here is a link, scroll down the page:

    http://www.cruiserparts.net/parts/fj80.html

    Not affiliated, I just want to see Nick take care of his Cruiser the right way.
     
  4. nyk438

    nyk438 Guest

    [quote author=Cruiserdrew link=board=2;threadid=11093;start=msg100164#msg100164 date=1076037631]
    Nick-Here is a better idea. Did you in fact trash the alternator in the mud bath you gave the cruiser? Cruiserparts.net has an alternator from a '91 for $100. Don't mess around and booger rig your cruiser or you'll end up with crap. Here is a link, scroll down the page:

    http://www.cruiserparts.net/parts/fj80.html

    Not affiliated, I just want to see Nick take care of his Cruiser the right way.
    [/quote]

    Thanks! But will it be alright to offroad with and run two lights on a bullbar? I'm just worried about having the same thing happen again this time. Not going through mud pits, but just normal mudding shouldn't it be fine?
     
  5. Mr.Bryan

    Mr.Bryan

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    mud destroys everything! Not to rain on your parade or anything, but if your going to keep mudding you may keep blowing up alternators unless you can figgure out a way to keep it from getting wet. It wont be everytime you go out you smoke one, but you'll probably replace it once a year. But maby I'm wrong. Thats just my experiance with mud and alternators. Thats why i'm proud to have my IH8MUD sticker on my truck!

    -Bryan
     
  6. CruisinGA

    CruisinGA

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    Bryan, is this really true?
    I know mud is not really good for things, but I've had my 40 alternator under water while running, and its near impossible to wheel period in GA without encountering mud.
    I guess I don't want to fry the alternator in my mom's 80 when I steal it and go wheelin. :D
     
  7. Cruiserdrew

    Cruiserdrew SILVER Star

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    I think 80 series alternators really hate mud. Nick fries his, my buddy fried his in some local mud and also fried a transfer case seal. For mud you need an old rusty domestic pick up with a big ole' V-8. Usually they can be bought for less than $1000. Don't torture a perfectly good Cruiser (especially an 80 series) by running through mud bogs!!! If you happen to hit some mud during a trail ride that's one thing, but mud bogging for sport in such a nice truck is foolish.(Nyc-I'm really sorry to sound like your dad). If you mud your 80, you will soon find that more than the alternator is fried. I could go on and on about why mud is insidious and bad for your truck but I won't. Unless you have very deep pockets, treat your ride with more respect. :slap:
     
  8. nyk438

    nyk438 Guest

    [quote author=Cruiserdrew link=board=2;threadid=11093;start=msg102876#msg102876 date=1076462521]
    I think 80 series alternators really hate mud. Nick fries his, my buddy fried his in some local mud and also fried a transfer case seal. For mud you need an old rusty domestic pick up with a big ole' V-8. Usually they can be bought for less than $1000. Don't torture a perfectly good Cruiser (especially an 80 series) by running through mud bogs!!! If you happen to hit some mud during a trail ride that's one thing, but mud bogging for sport in such a nice truck is foolish.(Nyc-I'm really sorry to sound like your dad). If you mud your 80, you will soon find that more than the alternator is fried. I could go on and on about why mud is insidious and bad for your truck but I won't. Unless you have very deep pockets, treat your ride with more respect. :slap:
    [/quote]


    I agree...I usually DON'T go through mud pits. It was my first time with the car and I had a friend whos farily expirienced and said his truck made it thought no problem. The only problem I had was that I was driving through the pit and drove way to fast and ended up having water come over the top not from the bottom. I LOVE my 80. My next LC though I think is gonna be a 40.
     
  9. Landpimp

    Landpimp

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    mud(muddy water) ate my alt on the 80, it took alot............but it went out the next day