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Dimming lights??

Discussion in 'Residential Snow Removal' started by sempertrue, Dec 7, 2004.

  1. sempertrue

    sempertrue Junior Member
    Messages: 4

    I have a 2002 f150 7700 with heat on at night when moving plow all lights dim. is this a grounding problem, battery or alt? truck has 25K miles. thanks for suggestions
  2. grotecguy

    grotecguy Senior Member
    Messages: 148

    Sounds like normal operation to me. The pump draws quite a bit of current while moving the blade.
    If the lights stay dim, then maybe you need to do some further investigation.

    Good luck,
    Mark K
  3. Crumm

    Crumm Senior Member
    Messages: 529

    It is normal for your lights to dim a little when moving the plow. If you are running your batteries dead then you may need to look into a larger alternator. If the lights are getting very dim when you move the plow (to the point you cannot see) you may need to look into a larger battery or maybe dual batteries.
  4. scottL

    scottL PlowSite.com Addict
    Messages: 1,613

    if the battery is original from the dealer - you probably could use a better one. Then make sure your alternator is at least 140 amps. Beyond that a little dimming will probably always happen but, it should not be drastic.
  5. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    Any alt off about 100 amps or more will do just fine, no need to run out and buy a bigger alt. (many years ago I plowed with a 70 amp and never died in action with it) Plow motors can draw 100 to 150 amps when running and can surge at over 200 amps for a fraction of a second when they first start which can be noticable in lights. Dual batteries will help stabilize voltages better than a bigger alt will when plowing snow.