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Batteries for the CUCV

Discussion in '1982-Present GM Diesel' started by 84CUCV, Aug 1, 2004.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    I have two cheap batteries I just dropped in. One is 540 cca and the other is 7 something. Hit the key and smoke came from one batteries and there was very little power like they where dead. They are fresh off the charger. Checked it out, everything was good and tight hooked up right. Tried it again and it started ran for a few and just shut off. Tried to start and there was no power. What the heck is going on?? Melted the lead too. Did I get bad batteries?

    thanks mike
     
  2. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    I have two cheap batteries I just dropped in. One is 540 cca and the other is 7 something. Hit the key and smoke came from one batteries and there was very little power like they where dead. They are fresh off the charger. Checked it out, everything was good and tight hooked up right. Tried it again and it started ran for a few and just shut off. Tried to start and there was no power. What the heck is going on?? Melted the lead too. Did I get bad batteries?

    thanks mike

    [/ QUOTE ]

    Well first off, when you have 2 batteries, it's always better to have them same size same age, or one will drain into the other.
    The other thing is your cables and the post clamps, you want to make sure they are sized properly and that they are clean from deposits, especially between the cable and the connector, it's hidden and most times you will not see it.
    If you have to do with those batteries, make sure you connections and cables are the best you can.
    /forums/images/graemlins/thumb.gif
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    what batteries are you using? I will buy a set then.

    Mike
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Is it still a 24 volt starting system?

    I run a pair of AC Delco's ~950 CCA's each...but my system is 12 volt.

    Rene
     
  5. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    still have the 24v. Going to 12v as soon as i find wireing for the motor, my is cut up. thanks
     
  6. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Just hooked up new batteries. Same size and age. I was doing it fast, before i go out. Wanted to see if it would start up. last connection, it sparked, smoke cam from the two posts and melted the insulation of the blue wire on the relay. OK this sucks, do I have bad wiring? Back bat + to the firewall and the front one with the + to the driver side firewall wall, pretty sure that’s right. what else could it be?

    thanks mike
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You're hooking something up backwards and creating a portable welder...

    Rene
     
  8. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    I see. Crap what did i just fry...

    mike
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    A 24 volt starting system must have the batteries hooked up in series. The + lead from batt one should go to the starter, the - lead of batt one should go directly to the + post on batt two, and the - lead of batt two should go to engine block, frame and body.

    I would guess there is also a lead from + on the second battery feeding the rest of the truck, IIRC only the starting system was 24 volts right?

    Rene
     
  10. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Yea it is 24V. thanks
     
  11. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK its all hooked up right with good bats. What else could it be? dead short? I think that is when wire to steel contact? right? How do i trace it? thanks

    mike
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Dead shorts suck, but some logic can be used to trace them down.

    I'd say you have a pretty good size wire grounding out judging bywhat it's doing. A smaller wire would burn up in no time with 24 volts and the kind of amperage you have with 2 batt's in series.

    Check the leads down to the starter...they do go through a hostile area with all the heat, sharp corners etc etc. I've had a few main leads burn up and ground out. I've also had leads where the steel ring happens to be touching something it shouldn't on the starter.

    You're just gonna have to look at it all...

    Rene
     
  13. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    thanks trustyk5, that is where i will start. /forums/images/graemlins/waytogo.gif

    Mike
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Keep us posted!

    rene
     

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