1. #1
    awwphooey@hotmail.com's Avatar
    awwphooey@hotmail.com is offline Junior Member
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    Wrangler sputters when headlights are on

    Hello- hoping you folks can point me in the right direction?

    My brother in law has a '90 Wrangler. We were driving to the store today, and when he turned the lights on, the vehicle started sputtering and stuttering. I looked at the ammeter, and it was going nuts. As soon as we turned the lights off, no problems.

    Going to check everything with a voltmeter later today when I get off work, but in the meantime- any known issues of this nature been mentioned or experienced by anyone previously?

    Thanks in advance,
    Steve

  2. #2
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
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    Re: Wrangler sputters when headlights are on

    I'd start with all the connections and grounds. Check the battery >12V and alt output volatge >14V. I had an issue like this in my old 95 F150 with the ammeter jumping. It was th brushes shorting out in the alt. new brushes and about 1/2 hr back in business.

    Any other electrical component do this like blinkers, radio or heater/air fan?
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3
    54cj3b's Avatar
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    Re: Wrangler sputters when headlights are on

    take alternator to parts store and have it checked bet its bad
    ALL I OWN ARE JEEPS!

    54CJ3B ,76DJ5RHD , 81DJ5RHD, 88XJ , (It's)93XJRHD(Alive), 06KJ ,

  4. #4
    TerryMason's Avatar
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    Re: Wrangler sputters when headlights are on

    Sounds like an alternator to me too. Luckily they are pretty cheap
    1990 Jeep Wrangler Alternator - Bosch
    My 2005 Wrangler Build Thread

    “He who is without oil shall throw the first rod.” -Compressions 8.7:1

  5. #5
    Gennybro's Avatar
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    Re: Wrangler sputters when headlights are on

    sounds like voltage regulator to me,some voltage regulators are built into the alternator,which means that indeed you need to replace alternator.If it is not built into the alternator,I believe it'll be located on the firewall.
    Befor buying anything,find out for sure where your voltage regulator is located.

  6. #6
    carnuck's Avatar
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    Re: Wrangler sputters when headlights are on

    Sounds like the ground wire to the body is loose or missing. That would require the ground for the ignition system and headlights to travel through the engine, trans, driveshaft and Ujoints to the axle and springs, then back to the coil, lights, etc.
    '87 Comanche 4x4 lifted 5 1/2" on 33" tires 4.0L/AW4/NP242 $3500
    Perfect combination but too small to haul my Grand Kids and wife in.


  7. #7
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    Re: Wrangler sputters when headlights are on

    Sounds like an awfully long trip.

  8. #8
    54cj3b's Avatar
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    Re: Wrangler sputters when headlights are on

    WOW 4 sounds likes in a row :) That's gotta be a new record
    ALL I OWN ARE JEEPS!

    54CJ3B ,76DJ5RHD , 81DJ5RHD, 88XJ , (It's)93XJRHD(Alive), 06KJ ,

  9. #9
    Gennybro's Avatar
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    Re: Wrangler sputters when headlights are on

    Its a twisted jeeper thing,only the jeep gods know about it, shhhhhhhhhhh

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