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alternator question

Discussion in 'Chevy Trucks' started by plowinzr2, Jan 25, 2007.

  1. plowinzr2

    plowinzr2 Senior Member
    Messages: 112

    I've got an 03 S10 with the 4.3 V6 and a 6'9 LD Fisher on the front. I finally got to use it the other nite and i notice way to much of a voltage drop when i move the plow, it was enough for me to have to shut of my lightbar. Where can i get a bigger alternator and how big do i need it?
  2. lawnmedic

    lawnmedic Senior Member
    Messages: 703

    How low was your voltage going when running your pump? My volt gage drops to 10 volts when the pump is operating. I have a 130 amp alternators on all my trucks.
  3. plowinzr2

    plowinzr2 Senior Member
    Messages: 112

    yea it drops to about that. i can hear the light bar slow down when i move the plow but i mean is it bad for the truck to keep drawing like that? i was thinkin mayb gettin an optima idk if that would help ive heard good and bad thing about those batteries.
  4. diehrd

    diehrd Senior Member
    from NY
    Messages: 199

    Even dual batteries suffer this drag when you operate the plow. I have a single in the truck i pow with and I drop to about 11v when lifting or turning plow. I think the key to the system is in the alternator , I have a 130amp BUT may go to 180 because I use heated seats and mirrors while i plow.
  5. Mark Witcher

    Mark Witcher Senior Member
    Messages: 605

    You cant get an alternator big enough to stop the plow from pulling the volts down. Plow motors draw 200 amps or more. I have been plowing for over 15 years with various trucks and plows. Never needed more than single heavy duty battery and 100 amp alt..
  6. plowinzr2

    plowinzr2 Senior Member
    Messages: 112

    alrighty then ill probably look into changing my battery a lil later on and ill change the alternator when i have to. thanks for all the help guys
  7. KCB

    KCB Senior Member
    Messages: 153

    I replaced my alternator in my old Ford Ranger with a high out-put one, I also had an Optmia battery. Although the plow moved much faster with the new alternator, it blew fuses like a $3.00 *****. That truck is gone now and I have a 02 Zr2 Sonoma (same as yourself) and I'm just going to leave well enough alone. If it ain't broke, don't fix it.
  8. plowinzr2

    plowinzr2 Senior Member
    Messages: 112

    yea exactly what type of plow u got on it?
  9. KCB

    KCB Senior Member
    Messages: 153

    I have a Blizzard 680.
  10. mreamer

    mreamer Member
    Messages: 86

    Make sure your connections are good (tight, free from junk). You want the lowest possible resistance between the battery and the pump motor.
  11. carl b

    carl b PlowSite.com Addict
    from Ohio
    Messages: 1,330

  12. bowtie_guy

    bowtie_guy Senior Member
    Messages: 551

    Not sure on compatibility (would have to cross reference parts) but the LBZ duramax comes with a 145amp alt.

    Decent alt and dual batteries really helps but no matter what a plow motor draws alot of power.
  13. PLOWMAN45

    PLOWMAN45 2000 Club Member
    Messages: 2,951

    my needle moves also but it comes back up i have 145 amp alt