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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Voltage regulator

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    6/25/2017 9:01 AM  #1

    BillyC
    I FYI 24-7

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    From: Chesapeake, Va.
    Registered: 4/02/2013
    Posts: 967

    Voltage regulator

    My system stopped charging yesterday. The battery appears to be good so I'm suspecting the voltage regulator. It's an original type and I want to replace it with an electronic one. Any suggestion where to buy where not to buy? 66 coupe, 289, stock alternator, no a/c.

    "anyone that stops learning is old, whether at twenty or eighty"Henry Ford
     

    6/25/2017 12:31 PM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,780

    Re: Voltage regulator

    I got mine from OReillys. Got one for a 79 Mercury, but I bet if you tell them for a 66 Mustang you get the same thing.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    6/25/2017 8:41 PM  #3

    rhutt
    FYI Addict

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    From: Santa Clarita, CA
    Registered: 1/10/2017
    Posts: 109

    Re: Voltage regulator

    O'Reilly's here. They carry BWD Select electronic units for $25.99. Mine works great!

    '66 GT Fastback, 302, Edelbrock top end, Sniper EFI, MSD, JBA Headers & Exhaust, T-5Z, Currie 3.55 Trac-Loc
     

    6/28/2017 11:26 AM  #4

    jkordzi
    I FYI 24-7

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    From: Sequim, WA
    Registered: 12/28/2013
    Posts: 944

    Re: Voltage regulator

    I would put a volt meter on the battery while the engine is running.  If the alternator and regulator are both doing their job, you should get around 13.5 volts.

    Cheap, Fast, Good:  Pick Any Two
     

    6/29/2017 7:00 AM  #5

    coachJack
    Active Member

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    Registered: 5/23/2017
    Posts: 8

    Re: Voltage regulator

    To test the alternator, you need to excite the circuit by revving the engine above 2000 rpm. Turn on the headlights, stereo and heater blower to place a load on the electrical systems. Next measure the voltage at the Bat post on the back of the alternator or at the starter solenoid Battery terminal. This should measure between 13.5 and 14.5 volts. 

    If the system reads only 12 V, basically battery voltage, then disconnect the plug at the voltage regulator. Using a jumper wire with male connectors on both ends, place one end in the F terminal connector and the other end on the A connector. This effectively bypasses the voltage regulator and provides full excitation to the alternator. The voltage reading at the bat post should now read 15V. If it still reads only 12 V, then the wires to/from the alternator and the regulator are suspect.

    Coach Jack

     

     

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