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Thread: LED Headlights burned charging circuit

  1. #1

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    04-30-2019
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    Location

    Houston TX
    Vehicle

    1993 Mitsubishi Mighty Max
    Engine

    4G64

    LED Headlights burned charging circuit

    Good morning Mighty people,
    I have a problem I created by upgrading my Headlights. I got a pair of turbo SII nice lights to pair a new set of LED fog lights I installed prior. When I turned the lights on dash lights dimmed until I started driving when they when back to normal. After that it stranded me the following day with a dead battery. I got out and checked both alternator and battery and both checked ok. Checked all the fuses and they are all ok. I honestly donít know what to do next???🥴

  2. #2

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    03-16-2018
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    225
    Location

    Raymond New Hampshire, USA
    Vehicle

    1989 Dodge Ram 50
    Engine

    G54B
    I would start by checking the current draw of the new headlights with an ammeter. I would think the headlight wires would melt before the alternator wire if they were the culprit. a 120 watt bulb should draw 10 amps. Not sure what the wattage of your led's are, but if we assume 55 watts, that should be about 5 amps a headlight.

  3. #3

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    06-15-2014
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    3,756
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    The LED's "shouldn't" roast the alternator but there may be any number of reasons for the failure. Check all of your ground leads - they are responsible for all kinds of gremlins when they get fouled up. Check the main battery lead for signs of corrosion. Also take a look at your alternator. Always a chance someone swapped it for a low amp unit or there is actually something wrong with it like a cooked diode. It might be time to beef up your charging system with a higher output alternator anyway...
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