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Lights dimming

Discussion in 'Truck & Equipment Repair' started by Khowie644, Dec 9, 2011.

  1. Khowie644

    Khowie644 Member
    from Maine
    Messages: 93

    Just got my back up truck ready to go for the season yesterday, seems every time I use anything that draws power the lights in the cab and on the plow dim. Has dual battery setup, optima yellows, Big Three wiring done, and 130A alternator that came with the truck(F250).
    To explain further: When I use all the buttons on my fishstik except lowing plow my lights on the plow and (if they're on) the interior lights will dim. I thought it had to do with plow, so I unhooked the wiring and turned on the interior light, when using the window switch the light would still dim.
    Charged both batteries on charger, cleaned all connections, made sure everything was hooked up right, no answers. I'm thinking I need a bigger alternator but even when I shut the truck off and try the window switch the lights still dim so I don't know if that would fix it and don't want to spend the money on a new one if I don't have to as we haven't got any snow yet to justify the purchase.
    Need some help!
  2. White Gardens

    White Gardens 2000 Club Member
    Messages: 2,665

    I'd check your grounds first.

  3. Ctll

    Ctll Member
    from midwest
    Messages: 82

    Load test batteries separately, sounds like one has a problem so it is pulling the whole system down.