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Technical mopar regulator pulsing

Discussion in 'The Hokey Ass Message Board' started by trollst, Apr 6, 2018.

  1. trollst
    Joined: Jan 27, 2012
    Posts: 2,025

    trollst
    ALLIANCE MEMBER

    Built a 29 dodge 4 door, used a 73 dodge 360 and 727 in it with the Chrysler charging system just like it came out of the motorhome it was in. Parked all winter, flashed it up and the lights and voltmeter pulse like mad, it was a minor problem last year but manageable.
    The voltage regulator is a solid state unit, what I want to know is how to fix this problem. It seems to be fairly common on dodge car websites, I wired the car year before last, the charging system works fine except for this pulsing thing. And yes, that's my ugly face. DSC05918.JPG
     
  2. gene-koning
    Joined: Oct 28, 2016
    Posts: 2,376

    gene-koning
    Member

    Be sure you have a good ground for the regulator. Over the years, I've learned to add a ground wire to every Mopar electrical component. The self tapping screws that hold the component onto sheet metal can deteriorate pretty quickly, painted components and mounting surfaces don't help either. Gene
     
  3. trollst
    Joined: Jan 27, 2012
    Posts: 2,025

    trollst
    ALLIANCE MEMBER

    Got a ten gauge ground on the regulator to the body, and a ten gauge ground on the alternator to the block, ten gauge block to battery via the frame, everything grounded. I should add that this is regulator number three, thanks Gene.
     
  4. After checking all the normal stuff (connections, grounds and such), and seeing as how you've already had multiple regulators on the car, try a different battery. I've run into this a couple of times in the past where a battery that seems OK otherwise will cause the voltage to pulse like that.
     

  5. BJR
    Joined: Mar 11, 2005
    Posts: 6,905

    BJR
    Member

    Have you checked the brushes in the alternator? If they are hanging up in the brush holder or almost warn out it may pulse like that.
     
  6. squirrel
    Joined: Sep 23, 2004
    Posts: 48,784

    squirrel
    Member

    Have you tried taking out the voltmeter? :p

    How much voltage pulsing is there? is it going from 11v to 16v and back? or 13v to 14v? or what?
     
  7. trollst
    Joined: Jan 27, 2012
    Posts: 2,025

    trollst
    ALLIANCE MEMBER

    Alternator one season use, squirrel, the voltmeter reads 14.5, but pulses enough to show in the lights. It's almost like a tic in a person, when it's charging heavily, it's good, but when it's reached a float position the voltmeter shows a steady tic, like I said, everything new. I could just change it out to a gm 10 si, but that doesn't give me an understanding of why this is happening. The regulator is solid state, so, not controlled by mechanical means, shouldn't happen. It's almost like the battery is being overcharged, but it isn't, other than this pulse, everything normal. I'm lost.
     
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 48,784

    squirrel
    Member

    Which lights are pulsing? The headlights, or the dash lights? or both?

    What kind of gauges do you have in the car?
     
  9. trollst
    Joined: Jan 27, 2012
    Posts: 2,025

    trollst
    ALLIANCE MEMBER

    All the lights, you can see the headlights pulse, it has year old autometer gauges, It could be the regulator, or the battery could be at fault, battery reads 14.5 running and 12.5 sitting no ignition on. I'm sure it has nothing to do with how it's wired, I've read a bunch on dodge truck forums and it seems to be a common problem that's mostly ignored. The alternator was replaced, a diode went bad and it kept killing the battery, but the battery wasn't replaced, after sitting outside in minus temps for three months, the battery had enough life to crank the car over but it required a boost to start it. I'm leaning to the battery, although, since the car has been on the road, it seems fine, never lags, car starts right up after sitting for days in 30-50 degree temps.
     
  10. squirrel
    Joined: Sep 23, 2004
    Posts: 48,784

    squirrel
    Member

    Have you tried another regulator?
     
  11. bct
    Joined: Apr 4, 2005
    Posts: 3,097

    bct
    Member

    If one alternator diode goes it turns to AC which may produce a pulse.
     
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  12. bct
    Joined: Apr 4, 2005
    Posts: 3,097

    bct
    Member

    Test your alternator with the AC function should have very little. Less than .10 v
     
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  13. squirrel
    Joined: Sep 23, 2004
    Posts: 48,784

    squirrel
    Member

    If the diode is bad, the "pulse" will be fast and regular. if it's the regulator, or something loose, it will probably be irregular, and slower.
     
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  14. rusty valley
    Joined: Oct 25, 2014
    Posts: 2,528

    rusty valley
    Member

    i've owned 3 old diesel dodge trucks, they all pulsed at idle enough that you could see it on the garage wall with the head lights on. worked fine, and i kinda liked it. it was easy to see that it was charging
     
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  15. trollst
    Joined: Jan 27, 2012
    Posts: 2,025

    trollst
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    The pulse is fast and regular.
     
  16. Truck64
    Joined: Oct 18, 2015
    Posts: 4,635

    Truck64
    Member
    from Ioway

    Switch to DeCaff. Did this get fixed?
     
  17. 4tford
    Joined: Aug 27, 2005
    Posts: 1,751

    4tford
    ALLIANCE MEMBER

    Do you have a ground from the engine to the body? With body isolators and engine mounts a good ideal is to add a braided ground strap from the engine to the body and batt negative directly to the engine.
     
  18. trollst
    Joined: Jan 27, 2012
    Posts: 2,025

    trollst
    ALLIANCE MEMBER

    Engine grounded to frame and body, still there, still not fixed, gotta be the regulator.
     
  19. greybeard360
    Joined: Feb 28, 2008
    Posts: 1,709

    greybeard360
    Member

    I bought a regulator from AZ... Echlin. It didn't work. They sent another one to my shop... No workie. The parts guy checked them both on their tester... Dead. He check the other 4 they had in stock... All dead. I had OR send a Borg Warner... Worked perfect.

    Be cautious on the brand you use.
     

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