1. #1
    Deerhunter30's Avatar
    Deerhunter30 is offline Senior Member
    Join Date
    May 2003
    Location
    Deer Park, Tx
    Posts
    338
    I'm having some electrical problems and cannot decide if the battery or alternator need to be replaced. I was out of town this weekend and when I tried to start my Jeep Sunday it would not start. The interior lights would not even glow. It is possible that I left the interior lights on, but I am not sure. I jump started it and now it only shows 12 or 12.5 on the volt meter. I ran it for about thirty minutes this morning and still showing only 12 or 12.5. I cannot decide if the alternator is not putting out enough or if the battery is bad. What is your guess?

    If it is the alternator is bad, is there a reasonably priced upgrad for my 83 CJ7? I was wondering if there was a better alternator that would bolt up and boost the output some. If there is a better alternator, what vehicle did it come on? I would like to be able to go into the local parts store and tell them I need an alternator off a ?????
    Josh,
    You will not be forgotten

    O|||||O

  2. #2
    wm69's Avatar
    wm69 is offline Senior Member
    Join Date
    Sep 2003
    Posts
    482
    Take your battery off the jeep and charge it with a battery charger. Put it back on and see what it looks like then. Check the battery cables (clean the ends). If you do still need an alternator I got a 135 amp alternator from www.alterstart.com for $60 that works good, but when I turn on all my accessories (2 sets KC's, headlights, defrost) i'm running right at 12 volts, so I wish I'd got the 180 amp ($129.00 and you have to replace a wire with a heavier gauge). At any rate, if you arent' running a bunch of lights the 135 is better than stock and not real expensive. Oh and if your battery is toast get an Optima. I know they're expensive, but my first one lasted 5 years (hard use too winches, lights, starting problems due to crappy carb etc), and I still got $25 credit towards another one (they have a 6 year warrenty/ prorated).
    85 CJ7 258, borla header,jacobs, weber, T5, B&M shifter,1pieceaxles,warn hubs/ XD8000i

  3. #3
    graewulf's Avatar
    graewulf is offline Senior Member
    Join Date
    Mar 2003
    Location
    Manahawkin NJ
    Posts
    1,316

    A few Pics from wheelin in Slade, KY

    when I need a higher amp altrnator i'd take it to the local starter/alternator shop and tell them what amperage I need it to output and they will custom wind it to put out what I need...
    When I Die, Bury me in my JEEP. 'Cause it's never been in a hole it couldn't get out of!

    1995 Grand Cherokee w/ swaybar disconnects and 30" tires and a 2000 Grand Cherokee stock.

  4. #4
    avyoung's Avatar
    avyoung is offline Senior Member
    Join Date
    Aug 2003
    Location
    Shoshone, ID
    Posts
    619
    If you are not sure run down to the local auto parts store and they will usually check for free and tell you which one is bad. Then you do not have to guess.
    80 CJ5 258, T-176, D300, D30, M20, Tera Flex Discos, Blazer Blower, Power Stearing, Power Brakes, Detroit Locker, Superior shafts, 32\" Mud Kings

  5. #5
    Bounty__Hunter's Avatar
    Bounty__Hunter is offline Moderator
    Join Date
    Nov 2002
    Location
    Southern Illinois
    Posts
    12,684
    Quote Originally Posted by graewulf
    when I need a higher amp altrnator i'd take it to the local starter/alternator shop and tell them what amperage I need it to output and they will custom wind it to put out what I need...
    That'll work on Delco alternators that earlier Jeeps used, like CJ's and earyl YJ's. Won't work on later model jeeps with the NipponDenso alternators.

    Click HERE and you can rebuild your own alternator to put out up to 105A for under $35. I did it, it's simple.

  6. #6
    Deerhunter30's Avatar
    Deerhunter30 is offline Senior Member
    Join Date
    May 2003
    Location
    Deer Park, Tx
    Posts
    338
    I went by my local Auto Zone and everything looks good. It appears that I left the interior lights on and it drained the battery. After charging it for a while I guess it is OK.
    Josh,
    You will not be forgotten

    O|||||O

  7. #7
    chinard's Avatar
    chinard is offline Senior Member
    Join Date
    Aug 2002
    Location
    Toronto
    Posts
    268
    Quote Originally Posted by Deerhunter30
    I went by my local Auto Zone and everything looks good. It appears that I left the interior lights on and it drained the battery. After charging it for a while I guess it is OK.





    That'll learn ya!!

    On that subject, i have seen contol modules for lights and so forth from both quadratec and jcw that allow you to set an "auto shut off" time for each of the control lights. I might just do that for myself sometime cause i've done the same thing...

    As far as the alternators, from what i've seen, all of th older model jeeps particularly CJ's have underpowered alternators.
    Either get a new one or rebuild yours with a bigger core. Its an easy job, i've taken my old one apart a dozen times before i just said screw it and bought a 150amp powermaster...
    Even with the powermaster i had some problems because the battery terminal lead bolt came loose and i had to take it apart to tighten it.
    The only tip i can offer if you are going to perform any alternator surgery is to get yourself a long, heavy guage sewing needle to slide into the little hole where the bushings are to keep them in place while you take it apart.
    \'82 CJ-7 - AMC 258 -
    Mods: Weber Carb, Borla Catback, Juicebox TFI, 31\" BFG AT, Powermaster 150a alternator, H4 headlights, blazer heater motor conversion, WORKING gas gauge.
    Now with 80% less rust!!!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in