Slow cranking issues?

Discussion in 'Electrical & Stereo' started by CManT1914, Jan 12, 2006.

  1. CManT1914

    CManT1914 New Member

    Messages:
    37
    Likes Received:
    0
    Joined:
    Jan 11, 2006
    If you have a problem with a slow cranking mustang, and it gets worse if the engine is already hot, then check your main groud cable. It comes off of the negative battery cable that runs along the front of the motor at the top of the oil pan. It's a metal band that is bolted to the block, right above the oil pressure sending unit, and in front of the oil filter. If it works it's way loose, it can cause all sorts of electrical issues.
     
  2. wytstang

    wytstang Well-Known Member

    Messages:
    2,233
    Likes Received:
    1
    Joined:
    Jan 11, 2006
    Sounds more like a heat soaked starter to me.
     
  3. CManT1914

    CManT1914 New Member

    Messages:
    37
    Likes Received:
    0
    Joined:
    Jan 11, 2006
    It wasn't. :)
     
  4. HISSIN50

    HISSIN50 New Member

    Messages:
    89
    Likes Received:
    0
    Joined:
    Jan 11, 2006
    Resistance in wiring goes up as the cable is heated. So a marginal cable (our cables are all 10+ years old) can show its weakness when it gets hot.

    Heat soak is also a possibility.

    As Chris and I know (I think perhaps Danny too), additional motor grounds (especially when upgraded alternators are used) can be beneficial.
     
  5. wytstang

    wytstang Well-Known Member

    Messages:
    2,233
    Likes Received:
    1
    Joined:
    Jan 11, 2006
    I have an extra 8 gauge ground running from the coil bracket to the driver side STB. If I find a better place I'll swap it out.
     
  6. HISSIN50

    HISSIN50 New Member

    Messages:
    89
    Likes Received:
    0
    Joined:
    Jan 11, 2006
    I chose to run a 2 or 4 AWG cable from the pass side of the motor (at the motor mount) to the frame on the pass side. Out of sight down there.....
     
  7. CManT1914

    CManT1914 New Member

    Messages:
    37
    Likes Received:
    0
    Joined:
    Jan 11, 2006
    I replaced the auxillary ground that goes from the frame to the engine block (right in front of the oil pressure sending unit, on a bracket) with a bigger cable.