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dual alternators?

Discussion in 'Ram Trucks' started by GreenKingL&L, Dec 25, 2007.

  1. GreenKingL&L

    GreenKingL&L Member
    Messages: 36

    My '02 CTD has two batteries, obviously, but has anyone ever put or tried to put 2 alternators on? I can't stand the lights and everything dimming every time I hit the plow switch, and on top of that I have a crap load of stuff on the truck. Deweze bale bed, strobe lights, plow, spreaders, stereo, winch, all that adds up to a lot of electrical strain.

    RODHALL Senior Member
    Messages: 374

    What CCA are the batts?
    What amp is the Alt?

    While you can hang another Alt on it, first look at what amp your ALT is 80 amp or 140 amp. if it is the smaller one why not just put the bigger one on and upgrade the wiring to handle the load.

    Also look at what CCA the batts are: 2 500CCA batts only =1000CCA where 2 900CCA bats =1800CCA the more CCA the more reserve you should have, the less dimming you should have.
  3. GreenKingL&L

    GreenKingL&L Member
    Messages: 36

    not sure about the alt, where would I find that info? The new battery I just put in pass side, the one the plow is actually wired off of, is 850 cca. I don't know about the stock one on the drivers side, I know you should really replace both at the same time so I will do that here today probably, but they are only just over two years old, stock mopar batteries. Which wiring would have to be upgraded?

    RODHALL Senior Member
    Messages: 374

    sticker on the underside of the hood will tell you what size alt you have. it give you 3 letter code and say high amp alt then the amprage. if the sticker is missing from the hood look at the size of the biggest wire coming off you alt. 80 amp wire is twice the thickness of a normal wire. the 140/160 wire is half the size of the batt cable or a tad bit smaller then a dime
  5. doh

    doh Senior Member
    Messages: 253

    Look to the after market for a High Amp Alternator. There are many manufacture's of the for car sterio's

    I run a GM factory 105 Amp, but @ low RPM for all my plowing needs, and a High Capacity battery.
  6. ProSeasons

    ProSeasons Senior Member
    Messages: 624

    I hate when they dim too! Check out this alternator for the slow turning Cummins;

    If you do duals, make this the second one. Or just drop it in as a replacement and save your stock alt for your dual project.

  7. GreenKingL&L

    GreenKingL&L Member
    Messages: 36

    looks like an awesome alt, have to come up with 369. and change, but would probably be worth it considering one that big wouldn't need two alts.
  8. packey

    packey Member
    Messages: 97

    You can look into after market alt's I will have to look the info up but their is a guy in Floriday who does custom alt's and charges by the amp output. He has one that is built that has 200 amps at idle speed for the v8 engines. I think this is the way I am going to go.
  9. lawn king

    lawn king PlowSite.com Addict
    Messages: 1,085

    My new duramax came with twin 125 amp alts. Part of the GM plow prep package. Look in the snoway forum tomorrow, i will post a picture there, its a sweet set up. I can run the works with no power drops at all!