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Thread: Voltage Regulator for 4A084 alternator

  1. #1
    KWAZY old Southerner... Duane Scarborough's Avatar
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    Voltage Regulator for 4A084 alternator

    Some of us plan to use the 4A084's original permanent magnet alternator for charging thier battery. The output of the alternator is about 40 volts AC at 3600 RPM. The original regulator-rectifier turns that into approx. 28.5 volts DC, for charging 24 volt batteries.

    That's no good if you plan to have a 12 volt electrical system.

    Fortunately, there's an easy, simple solution. Key West Controls makes a nice solid state voltage regulator/rectifier that works very well with the 4A084's alternator. Together they'll provide a 12 amp, 13.8 volt DC charging system, which is what we need for a 12 volt electrical system.

    You can find it at Aircraft Spruce for $59.95. Thier part number is PS030.

    Here's a link:

    http://www.aircraftspruce.com/catalog/e ... pwrsup.php

    Other places also carry it, but they all seem to have the same price.

    My airplane friend turned me on to this, and says they work great. It's a simple 4 wire hookup. Ideally, it should probably be mounted to a fairly large piece of framework, to provide a good heat sink.

    Duane
    A KWAZY old Southerner... and darn PROUD of it.

    Airboat Pros MiniPro 116 / Frog Spit
    SS rigging - with side by side seating
    Teledyne 4A084-4 engine
    Solex H30/31 Carb
    Arrow Prop 1.73:1 reduction
    67" Whirlwind 2 blade Mini Prop

    under construction

  2. #2
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    Re: Voltage Regulator for 4A084 alternator

    Thanks for the info on this, Duane.

    DT
    There is no normal life... There's just life. - Doc Holliday

  3. #3
    Senior Geezer buster's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    Duane and River Rat,

    I may have mentioned this before in an earlier post. My buddy, that retired after building generators for Onan for around thirty years, told me I could get a suitable voltage regulator for the 084 alternator, off of a junk lawn tractor. A new one would cost about $30.00.

    If you need more info, let me know.

    Dave
    IF YOU WON'T STAND BEHIND OUR TROOPS, THEN JUST STAND IN FRONT OF THEM!

  4. #4
    KWAZY old Southerner... Duane Scarborough's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    Buster,

    Tell us more. I knew you'd been holding out information.

    Duane
    A KWAZY old Southerner... and darn PROUD of it.

    Airboat Pros MiniPro 116 / Frog Spit
    SS rigging - with side by side seating
    Teledyne 4A084-4 engine
    Solex H30/31 Carb
    Arrow Prop 1.73:1 reduction
    67" Whirlwind 2 blade Mini Prop

    under construction

  5. #5
    KWAZY old Southerner... Duane Scarborough's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    Buster,

    I just sent you a PM.

    Duane
    A KWAZY old Southerner... and darn PROUD of it.

    Airboat Pros MiniPro 116 / Frog Spit
    SS rigging - with side by side seating
    Teledyne 4A084-4 engine
    Solex H30/31 Carb
    Arrow Prop 1.73:1 reduction
    67" Whirlwind 2 blade Mini Prop

    under construction

  6. #6
    Administrator Papee's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    Or you could go to radio shack and get the parts to make your own rectifier even cheaper.
    Please check out our YouTube channel and subscribe! Our YouTube Channel helps fund the site. Check it out at https://www.youtube.com/channel/UCTv...FrJP7yQVFVZnyA


  7. #7
    KWAZY old Southerner... Duane Scarborough's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    Papee,

    The rectifier part would be very easy, and pretty cheap. The regulator part, maybe not. You ain't gonna find anything you need at my Radio Shack. Mostly what they have are cell phones, computer gadgets, IPOD things, toys, and batteries.

    Yeah, it could be built from scratch. But not everyone has the savvy or time to do that.

    I just got off the phone with Buster, and he says he's got a line on a regulator/rectifier that'll also work, for about half the price.

    Thanks,

    Duane
    A KWAZY old Southerner... and darn PROUD of it.

    Airboat Pros MiniPro 116 / Frog Spit
    SS rigging - with side by side seating
    Teledyne 4A084-4 engine
    Solex H30/31 Carb
    Arrow Prop 1.73:1 reduction
    67" Whirlwind 2 blade Mini Prop

    under construction

  8. #8

    Re: Voltage Regulator for 4A084 alternator

    Use to be able to buy anything electrical from Radio Shack... my local one is nothing more than a junk store these days.

  9. #9
    Senior Geezer buster's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    OK, I just talked to Hank, and he found one on Ebay for
    $31.95. It is a three wire hook up, and he claims it will charge 3 amps, to about 20 amps, depending the state of charge of your battery, and the speed of the engine. The Ebay item no. is 360148639768.

    Hank said I do not need to buy a new one, there are lots of them on junked out lawn tractors. I think he said most any one with a built in alternator should have one. Hank does not buy a lot of new stuff if used is available at give away prices: :P

    Dave
    IF YOU WON'T STAND BEHIND OUR TROOPS, THEN JUST STAND IN FRONT OF THEM!

  10. #10
    KWAZY old Southerner... Duane Scarborough's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    Buster,

    You get the Gold Star this time.

    That should work just fine, and a good scrounger can find one for free.

    Duane
    A KWAZY old Southerner... and darn PROUD of it.

    Airboat Pros MiniPro 116 / Frog Spit
    SS rigging - with side by side seating
    Teledyne 4A084-4 engine
    Solex H30/31 Carb
    Arrow Prop 1.73:1 reduction
    67" Whirlwind 2 blade Mini Prop

    under construction

  11. #11

    Re: Voltage Regulator for 4A084 alternator

    Hi Duane:

    Know this an old post. I was wondering if anyone who used this product could tell me if they liked it. Im kicking ideas around for the charging system. I plan on running at least one light bar, navs/anchor, and comms. Thanks for any information.

  12. #12
    Member aewrigh's Avatar
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    Re: Voltage Regulator for 4A084 alternator

    I just installed the onan voltage regulator. I will get some numbers after I fire it up

  13. #13

    Re: Voltage Regulator for 4A084 alternator

    Thanks Aewrigh. Just want to make sure I dont run out of light!

  14. #14
    Member
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    Re: Voltage Regulator for 4A084 alternator

    this is what i use. i needed to make my charging system work so i could hook my tach up to it. wouldn't work with mag hook up.
    https://www.ebay.com/i/252945038062?chn=ps&dispItem=1

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