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  • Help no start

    Well, I was overhauling my cooling system. While doing this I removed the alternator do access one of the cooling hoses. I had forgot to disconnect the battery. While I was doing this my wrench touched the positive part of the alternator and a big spark came off. I then realized I did not disconnect the battery and took care of it.

    Move forward, got everthing back together and now the car won't start. It cranks but will not start. What did I do?
    Dan

    88 M3
    Black on Black

    San Diego, CA
    USA


  • #2
    There is an inline fuse on the secondary (ie smaller) cable that runs from the battery to the front power distribution that's behind the coolant overflow tank. This is a ~50amp fuse, that over time can go bad. The fuse is located within 6-12" from the positive battery terminal post.

    The DME get power from this cable. I would check to see you get 12v from this cable and haven't blown that fuse.

    Otherwise, check for power at the DME relays....


    Nick

    Comment


    • #3
      I think I found the problem. I started taking everthing apart. 2 things I changed. Not sure which was the problem solver.

      1. The ground on the alternator was barely haning on. I am going to have to order a new one. In the mean time I made my own.

      2. I had to discounnect 3 connectors above the coolant lines going through the fire wall. It is possible I did not put these together in the right order. I took them apart and put them back in the positions I think they should go.

      Either way the car started.
      Dan

      88 M3
      Black on Black

      San Diego, CA
      USA

      Comment


      • #4
        The ground to the alternator is not the problem. That is the one with a crimped wire with a rubber boot over the terminal. They do get disconnected when alternator comes apart. If disconnected, all you will have is that the batteries will not be charging. That is why I have mine soldered after twice giving out....so, it should be the 3 connectors that goes through the firewall.....Are these connectors on the driver's side? Glad it starts and running.
        Lawrence

        BMW CCA San Diego Chapter #192742
        '90 M3 AWII - Garage Queen
        '09 540i Touring 6 Spd - Son's DD
        '03 530i 5 Spd - SO's DD
        '03 Nissan Frontier Crew Cab - My DD & Range truck
        '05 330i ZHP 6 Spd - Alternate DD
        '15 Honda Pilot - Daughter's & Grandkids Hauler

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