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CAT 247b No Start Issue

Discussion in 'Skid Steers' started by Donzi, Sep 7, 2020.

  1. Donzi

    Donzi New Member

    Joined:
    Aug 12, 2020
    Messages:
    3
    Location:
    Saratoga Springs, NY
    I've had a 2005 CAT 247b for a little over a year. It has 1050hrs and is in good shape overall. It was running fine, then parked for 2 weeks and won't start.
    Turn the key and no lights come on, hour meter goes blank, no crank
    Tried jumping with cables
    Replaced battery with new AGM
    Cleaned battery cables and checked for loose connections
    Checked for blown fuses, haven't found any.
    Replaced ignition and safety switch on bar in cab - no change
    Have 12.5v between battery posts
    Have 12.5v to starter, main breaker and positive jumper post near relays/main breaker with key off
    Have 3-5v to starter, main breaker and positive jumper post with key on
    Sometimes the dash lights will come on with the key and it will get 12.5v everywhere until I go to start it. Then the dash will go blank and the voltage will drop back to 3-5v when checked. The starter will only click once, no crank.

    Any recommendations? I'm at a loss.
     
  2. 74inchShovel

    74inchShovel Well-Known Member

    Joined:
    Jan 19, 2008
    Messages:
    156
    Location:
    Washington
    Do you have 12.5 from battery hot to frame? Take apart all grounds and clean. A bad ground can pass the micro current that will allow a volt meter will read as 12.5 but when you try a much higher amperage it won’t go.
     
  3. Nige

    Nige Senior Member

    Joined:
    Jun 22, 2011
    Messages:
    20,480
    Location:
    G..G..G..Granville.........!! Fetch your cloth.
    That would appear to be the root of the issue. Is the 3-5V is measured at the incoming or outgoing side of the main breaker.? Simply turning the key from off to on should not do that. I wonder if there is a relay sticking somewhere.?

    Do you have the electrical schematic for it..? If not post the S/N and you can have a copy.
     
  4. Donzi

    Donzi New Member

    Joined:
    Aug 12, 2020
    Messages:
    3
    Location:
    Saratoga Springs, NY
    Thanks for the suggestions. I removed, cleaned and reinstalled the main ground to the starter and the three ground straps I could find. I have 12.5v from the frame/block to positive terminal of battery when key is off. Now I only have 1v when the key is on.

    I will get one new relay and try swapping it out with the existing ones to see if that fixes it. I got the same voltage on both sides of the main breaker (12.5v key on, 1v key off). I do have a schematic that CAT Service emailed me. I just don't know what to look for when I have the same voltage everywhere.
     
  5. Donzi

    Donzi New Member

    Joined:
    Aug 12, 2020
    Messages:
    3
    Location:
    Saratoga Springs, NY
    Update. I replaced both battery cables and it started. Both old cables looked fine and didn't show any resistance issues with a multi meter. Thanks for the help guys.