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single wire alt

Discussion in 'The Garage' started by chevyman_400, Jun 18, 2006.

  1. chevyman_400

    chevyman_400 Registered Member

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    does any one know how to make a gm alt in to a single wire hook up???
     
  2. hack500

    hack500 1/2 ton status

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    my only advice is: avoid single wire alternators.

    just 'cuz something can be done doesn't mean that is should be done.:

    however, for the 10si type you can leave the white wire off and hook up the small red wire to the bat+ terminal. afaik, the "one-wire" (10si type) alternators are wired like that except it's internally done.
     
  3. diesel4me

    diesel4me 1 ton status Premium Member

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    Well,you can,but...

    There are special voltage regulators available to convert the older ones to a one wire unit..

    ....yes,its possible to just "jump" the small red wire on the plug to the stud where the "big" 10 ga wire goes,but leaving off the white wire will make the altenator not charge due to lack of feild coil excitation..it will however,"Kick in" and start charging by itself at about 2500 rpm,but the "flash" resulting from this often kills the diode trio in short order....why not just GET a one wire alternator to begin with??...or hook the 2 wire one up correctly??....:confused:
     
  4. hack500

    hack500 1/2 ton status

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    maybe I'm misreading the diagram (this is out of a '76 FSM and covers 10si's and 27si's) wrong but I still say the white wire(#1) is optional.

    [​IMG]
     
  5. uglytruk

    uglytruk 1/2 ton status

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    I'm changing from generator to int reg alt on my '62 Corvair, and read some where that the single wire is a half baked idea.
    Any help to find that or similar article?
     
  6. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

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    used single wire alts for a long time. Never had an issue.
     
  7. chulisohombre

    chulisohombre 1/2 ton status

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    i have the 100 amp single wire summit racing one.6 yrs and have not had trouble yet.it just hooks up from the terminal on the back of the alt to the positive batt terminal.it is internally excited from the time the rpm reaches 2000 rpm and stays charging until you shut it off.i needed the extra amps to run my msd ignition.the stock one was not holding the amps high enough to keep the battery voltage up and engine was misfiring.its nice because i was also blowing the stock regulator rectifier every couple of months.
     
  8. Zepplin

    Zepplin 1/2 ton status

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    Same here, I been running a 100 amp alt. for about 4+ years. It may not kick on until 2000 rpm but that hasn't been an issue for me.
     
  9. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    I'm not crazy about 1-wire alternators...

    most need to be brought up to a 1200 rpm or so "cut in" when the sensor turns it on. This varies from one unit to another... it's also an extra "failpoint" in the alternator..

    When I do my 200 amper for welding, it will be a 3 wire...
     
  10. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    The difference between the two setups are a externally excited voltage regulator, and self exciting regulator.

    I have replaced multiple Motorola altenators on different equipment with AC Delco 1 wire alts.... they are simple and work fine. I probably have 10 different pieces of equipment running GM 1 wire alts, I like simple....
     
  11. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    well, in actuality, a 1 wire is not as simple as a 3 wire.. it has the rpm sensor in it, thats an extra part to fail that a 3 wire alternator doesn't have...
     
  12. smalltruckbigcid

    smalltruckbigcid 1/2 ton status

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    I'm for the 3 wires as well. It takes a little more work to deal with but the results are better IMO.

    Had to edit a typo...whats a reslut:haha:
     

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