Where's the voltage regulator?

Discussion in '40- & 55-Series Tech' started by keithmccallie, Nov 19, 2003.

  1. keithmccallie

    keithmccallie

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    Where is the external voltage regulator on a 1985 FJ-60? I can't seem to find it. Is there anyway to test it? I'm having charging problems...
     
  2. Landpimp

    Landpimp GOLD Star

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    there isn't one, the reg is built into the alt, it's on top of it. Use a volt meter to check that your getting around 14volts-+ off the + post on the alt.
     
  3. keithmccallie

    keithmccallie

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    This alternator has a sticker on it that says ":This alternator must be externally regulated" There is a 2 prong green plug that plugs into the alternator, as well as a red cable that bolts to the terminal. The battery is discharging when the car is running. The battery is in good shape.
     
  4. Landpimp

    Landpimp GOLD Star

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    Thats pretty darn weird! all(US spec) fj60's use an internally regulated alt. Soundslike someone swaped out the stock one for a older Toyota alt or maybe a GM alt.

    FWIW the part number on a fj60 alt(it will be on a black tag) is 27060-61011, the reg(if built in) is a square deal on the top of the alt, will say SLF.

    So if you have a external alt, look on the firewall or fender for where the PO mounted it. Why the PO would do this is a mystery to me. From the green plug it does sound like a Toyota alt however.

    John H
     
  5. Landpimp

    Landpimp GOLD Star

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    if there is an external reg, you should be able to follow the wires from the alt to the reg.

    Now on my fj45 wagon with a 350chevy and GM alt, when I bought it, it had an externaly regualated alt on it.........BUT there was no external regualtor.......just plain ole NOT there.......now wonder it never charged worth a damn! Replaced wtih a GM internal reg alt......all better now ;)

    John
     
  6. Landpimp

    Landpimp GOLD Star

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    if looking for the voltage reg you will be looking for something like this
    [​IMG]


    hmmmmmmm, look at this
    http://store.yahoo.com/coolfj40/noname20.html

    they show an alt with external reg for a fj60.....very odd? and I'm not sure it's right....

    John H
     
  7. paulj

    paulj

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    Keith; I've got a '76 FJ 40 and I had the same problem with mine. I don't know very much about electrical systems but I can at least share what I went through. The 40 has an external regulator similar to the one pictured above. I took my truck to the auto parts store and had the alternator tested in the vehicle. They just hook up a pretty sophisticated looking tester to the battery terminals. In my case the readout said low diode output. The guy that tested it said that meant I needed a new alternator. Put one in, and I still had the same problem. Ditto when I replaced the regulator. Finally took it to a mechanic that knew how to trace down electrical problems, and he finally found that the wire that goes to the fuse box was disconnected. I think it's called the exciter wire. I'm not sure what the moral is other than don't throw money at a problem if you don't know the root cause. Also a lot of people will tell you that if you're draining the battery it's a bad alternator. Ain't neccessarily true as I just learned the hard way. If you think it might be the alternator, I'd take it out and have it tested.
     
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