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Low volts... WTF??

Discussion in 'Chevy Trucks' started by musclecarboy, Dec 6, 2010.

  1. musclecarboy

    musclecarboy 2000 Club Member
    Messages: 2,303

    I recently changed my alternator to a brand new Hitachi one and a pair of new batteries to Exide Sub-Zero and the volt guage in the truck hangs out around 10-12, dropped into the red when plowing last night..... With the stock Delphi alternator and Interstate batteries it was ALWAYS above 14.

    What the heck is wrong?? Bad alternator (doubt it because it will charge back up).... Bad batteries??

    Please advise!:drinkup:
     
  2. BlizzardBeater

    BlizzardBeater Senior Member
    from Maine
    Messages: 420

    10-12 volts indicate a no charge issue. Check for broken or loose wires. Check the charging voltage off the back of the alternator. It wouldnt be the first to quit after little use.
     
  3. REAPER

    REAPER 2000 Club Member
    from 60050
    Messages: 2,228

    Did you get those Exide bat's at wally world?

    What size alternator?

    Good grounds at engine and body?
     
  4. BlizzardBeater

    BlizzardBeater Senior Member
    from Maine
    Messages: 420

    Wal-Mart sells exides now? I thought they were strictly neverstarts. I've always had good luck with exides.
     
  5. 219PLOWER

    219PLOWER Junior Member
    Messages: 13

    I had the same prob in my 95. i upgraded all my grounds to 0 gauge and ran a 4 gauge from the back of my alternator to my Pos post instead of that stock 8 gauge. when im plowing it goes down too 11 when i lift up my plow and turn it. then it goes right back too 14v. ive got 2 optima red tops also. Try the upgrade in the wiring.
     
  6. musclecarboy

    musclecarboy 2000 Club Member
    Messages: 2,303

    I got the batteries at PartSource.

    As for the wiring, I'm pretty sure the duramax trucks come with heavy duty wiring already.
     
  7. heather lawn spray

    heather lawn spray PlowSite.com Addict
    Messages: 1,206

    the wiring may be heavy duty but so can the CORRISION. Polish the piss outta the connections
     
  8. musclecarboy

    musclecarboy 2000 Club Member
    Messages: 2,303

    They were all shiny but I scrubbed them anyways and put a dab of electric grease. PartSource said they'll swap the 105A alternator for the bigger 145 amp one for free so I'll do that first
     
  9. heather lawn spray

    heather lawn spray PlowSite.com Addict
    Messages: 1,206

    Always found the 105's wouldn't keep up to seriously long sessions. You'd have to stop and gun the engine for a few minutes to get the electrics back.