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Technical Help -How To Wire a 3 wire Alternator on 62 c10

Discussion in 'The Hokey Ass Message Board' started by lowroder, Feb 10, 2020.

  1. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    Guys I'm Looking For A Diagram Or How To Correctly Wire A 3 Wire Alternator On A 1962 C10 235. Has Original generator currently. Also What Do I Purchase 10si or 12si?
    Ive Researched other threads but nothing seems to hit on early years.
    Thank You For The Correct Needed info
     
  2. Just get the underhood harness from a 63 thru 66 truck and it all plugs in. Or use the 62 harness and wire it up with a alternator regulator . The easiest is to use a GM internal regulator alternator. use the idiot light wire to excite the internal regulator. or get a internal reg alt that has the one wire conversion.
     
    Truckdoctor Andy likes this.
  3. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    yes still wanting to use my original generator dash light.
     
  4. MAD MIKE
    Joined: Aug 1, 2009
    Posts: 772

    MAD MIKE
    Member
    from 94577

    Are you going to make your own wire harness or are you trying to adapt the existing three terminal external regulator to generator harness?
     
    lowroder likes this.

  5. The dash light connects to terminal 1. The stud on the back goes to the battery. Jumper terminal 2 to the stud on the back of the alternator.
     
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  6. Jack E/NJ
    Joined: Mar 5, 2011
    Posts: 836

    Jack E/NJ
    Member
    from NJ

    This seems to be about right if you can locate the ground side of the idiot dash light. If you can't locate it, then just leave terminal 1 unconnected without the idiot light.

    The stud on the back goes to the battery terminal on the voltage regulator if you want to keep the regulator mounted and the ammeter working. The regulator's armature & field terminals aren't used anymore.

    With terminal 1 unconnected and terminal 2 pigtailed to the stud in the back, you'll effectively have a 1-wire alternator setup. Sometimes you might have to blip the motor to get it to start charging on startup.

    If you ever find the ground end of the idiot light, just connect it to the terminal 1 and you'll have your idiot light back without having to blip the motor on startup

    Jack E/NJ
     
  7. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,861

    Mr48chev
    ALLIANCE MEMBER

  8. bchctybob
    Joined: Sep 18, 2011
    Posts: 5,190

    bchctybob
    Member

    Old wolf’s suggestion is the easiest but if you want to learn a little about 3 wire alternators look up; MAD Enterprises, Springville, Ca.
    They have some good information on their website.


    Sent from my iPhone using The H.A.M.B. mobile app
     
  9. [​IMG]

    This is the one to do with a 10si from a 73-74 Camaro and make sure the clock position will work for you.

    The only difference is to run the #2 wire to the battery lug on the back of the alt and cut the white wire at the harness tape. You only need to hook up the #1 (blue) to the brown wire to your warning light and the 10 gauge wire to the power side of the horn relay (to the back of the alt).
     
  10. trollst
    Joined: Jan 27, 2012
    Posts: 2,108

    trollst
    Member

    Easy as this.....there are two wires on the plug, run the white one to the acc side of the ign switch, this wire tells the alternator when the power is on and tells the alternator to charge, so....when the key is turned on, power flows TO the alternator, after the engine starts, power then flows back through this wire to the ign switch. If hooked anywhere other than acc, it will power up the system and keep the car running when you shut the key off, this will not happen on the acc position.

    The red wire on the plug should hook to the power feed side of the fuse panel. This wire tells the alternator how much power the car needs and tells the alternator how much amperage to put out while the car is running. If you loop it to the lug on the alternator, it only senses how much power the battery needs, it'll work but its not the proper way to wire it.

    The lug supplies all the power the alternator makes, use at least a ten gauge wire on this, eight gauge is preferred, hook it to the battery cable at the starter.

    I've tried here to simplify this, but it'll work every time, properly, you'll have a clean battery that isn't overcharged and a happy life.
     
  11. No that's not it. I just went and took pictures. the harness is the bottom portion of what comes out of the firewall the top part goes to the turn signals. The correct harness has the connections for the regulator headlights and horn in it. The harness for a dash light is different from the one for a guage. The factory harness simply makes it easy. however its not very hard to modify the existing harness to make it work. Many trucks don't have the accessory feature on the ignition switch. I use a light to activate the system. I wired a alternator and regulator on my 55. used a light to activate. Sometimes that light stays on after starting it. A quick rev starts it charging and the light goes out. 66 harness 001.JPG 66 harness 002.JPG 66 harness 003.JPG 66 harness 004.JPG
     
  12. 6-bangertim
    Joined: Oct 3, 2011
    Posts: 408

    6-bangertim
    Member
    from California

    IF the OP isn't adding alot of accessories, me thinks his time would be better spent locating a spare generator and voltage regulator - used or rebuilt. With a generator, I got NINE ( maybe 10 ) years out of a cheap Exide battery, a club buddy got 11 years out of a Walmart battrry! I'm sure it's because a gen charges at a slower rate, and is less likely to overcharge. I've seen a lot of alternator systems with moisture on the battery - the acid vaporising from heat from charging.

    About the only advantage of an alternator is that every parts store has 'em cheap - The last battery I bought was at AutoZone for $140!
     
  13. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    Going to use original harness as of now.
     
  14. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    I wanna use led lighting an I have a radio but nothing crazy .
     
  15. Chief 64
    Joined: Dec 10, 2010
    Posts: 249

    Chief 64
    Member

    Great info here!!!
    So are both 10SI & 12SI internal regulator?
     
  16. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    whats the correct 10si alternator to purchase?
     
  17. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    previous owner added LED turnsignal lights. an installed a classic car radio system nothing super crazy.
    I noticed when its at idle the generator light comes on..
     
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  18. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    Here's what i was told by fifthaveinternetgarage.com
    remove the larger wire(batt) from regulator an wire it to the small stud on alternator. remove the other two wires an tape off. Using a DA plug connect it to the alternator. one wire(red) goes to the stud on alternator same as the wire that was (batt). The other wire (yellow) goes to either + on coil or ignition switch if accessible or possibly the S terminal on the starter solenoid. this wire also has a diode which allows the engine to shut off . This is based of his alternator wire harness available from them.
     
  19. 6-bangertim
    Joined: Oct 3, 2011
    Posts: 408

    6-bangertim
    Member
    from California

    [QUOTE=
    I noticed when its at idle the generator light comes on..

    Tipical at times, if the battery is a little discharged. Can't hurt to check the charging voltage - s/b 13.2 volts, at 12-1500 rpm. Voltage regulators can be adjusted - see your Service Manual. Go husle a spare gennie and regulator, your battery will last much longer if you stay with what you have!
     
  20. lowroder
    Joined: May 17, 2011
    Posts: 151

    lowroder
    Member

    just figured a alternator would have more reliable charging.
    I'm not having a charging issue with my generator other then at ide it will illuminate the dash light.
    Just like I said fiqure a alternator to be more reliable
     
  21. thanks....good thread.......
     
    lowroder likes this.

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