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  1. J

    MerCruiser 3.0 MPI Electrical Short

    Apologize for not responding sooner - was waiting on parts to come in. Turns out the cheap coil I bought off Amazon has been the culprit all along the way here. The coil also smoked the relay - new coil from boats.net and new relay she runs like new. Really should have not went cheap on the...
  2. J

    MerCruiser 3.0 MPI Electrical Short

    Update- it turns out it has been the coil the whole time and it smoked the relay as well. New relays and new coil now and she runs like new again. I forgot who said the cheap coils could be the issue - well you were right. Ordered the one from boats.net - now I have to put the wiring harness all...
  3. J

    MerCruiser 3.0 MPI Electrical Short

    I absolutely agree with your advice - I just can not find a good diagram for the Mercruiser 3.0 MPI - plenty online for the 4.3 and 5.0 engines but not a lot that I could find on the 3.0. Welcome any recommendations on where I can purchase a Manuel that has a valid wiring diagram. You are also...
  4. J

    MerCruiser 3.0 MPI Electrical Short

    unwrapped the harness and traced the Red w/Black stripe wire from the fuse to the relay - nothing wrong with the wire. The second wire in on the fuse is Pink with White Stripe and it goes to each of the 4 injectors - later today after work I am going to disconnect all the injectors and see if...
  5. J

    MerCruiser 3.0 MPI Electrical Short

    all components disconnected - and fuse keeps blowing - my assumption is wire from fuse to relay is shorted out inside the harness somewhere. Really would like to know why it shorted honestly - guess I am unwrapping the harness to trace the short down. They do not make anything easy to get to...
  6. J

    MerCruiser 3.0 MPI Electrical Short

    I have found several diagrams online and none of the ones I found show the Red w/Black stripe wire. I have the SELOC manual but the diagrams are pretty useless in it. I am at the point of trying to run a separate line from the fuse to the relay - replacing the Red w/black wire - will I do damage...
  7. J

    MerCruiser 3.0 MPI Electrical Short

    I inspected the coil - there is nothing indicating anything wrong - when i disconnected the two connectors to the coil and the coil wire to the distributor the fuse still blew when the ignition switch in the on position. I did trace the Red with Black stripe wire from the fuse bank as the wire...
  8. J

    MerCruiser 3.0 MPI Electrical Short

    Disconnected the fuel pump and fuse still blew when ignition switch turned on. The only way the fuse does not blow is when the relay is removed. Jim
  9. J

    MerCruiser 3.0 MPI Electrical Short

    In the past couple weeks I have replaced the Starter the 90 amp starter fuse - and the 50 amp main circuit breaker - boat cranks over as it should with new starter. Boat ran fine last Fall - went to start it up and the starter would not engage so I replaced it - then discovered the 20 amp fuse...
  10. J

    MerCruiser 3.0 MPI Electrical Short

    I disconnected the coil and still the fuse blows when I turn the ignition switch on. Steps I have performed- Disconnected the IAC - fuse blows Disconnected the Coil - fuse blows Disconnect the Relay - fuse does not blow - Switched the Relay out with 2 other same 882751 Relays - fuse blows Any...
  11. J

    MerCruiser 3.0 MPI Electrical Short

    I had to switch the mounting rack from old coil to the new coil so it must have been from Amazon - there just are not that many components to a coil and the engine fired right up with it installed - of course until now… most parts on the engine have come from boats.net but I do remember...
  12. J

    MerCruiser 3.0 MPI Electrical Short

    I forgot to say that I started this troubleshooting because the boat will not start- it turns over fine but with the fuse that keeps blowing running the fuel pump relay - IAC and Ignition coil the boat will not start until I figure this one out. The electric priming fuel pump activates and...
  13. J

    MerCruiser 3.0 MPI Electrical Short

    Hello - I have been trying to fix this short for a while now. I need some help with a 2011 . The circuit that has a short is for fuse that is for Fuel Pump Relay, IAC and Ignition Coil. I disconnected the IAC turn the ignition switch on and fuse blows - disconnect the Relay and it does not...
  14. J

    Mercruiser 3.0 PCM-09 Code 3050

    No luck there, tried the number I had and someone else answered apparently, he changed his cell number. Thank you again everyone for all the help I greatly appreciate it. As soon as I get the new catalyst installed, I will post an update.
  15. J

    Mercruiser 3.0 PCM-09 Code 3050

    I know what I need to do now, thank you everyone for all the help and advice, I greatly appreciate your time on this. Once I get the new catalyst installed and do a load test I will post back. Will be a few weeks before I can get to this.
  16. J

    Mercruiser 3.0 PCM-09 Code 3050

    Going the carb route looks like would cost me more than just replacing the catalyst. Want to put it back to working order as easily as possible.
  17. J

    Mercruiser 3.0 PCM-09 Code 3050

    Thank you very much - I really appreciate all the help on this
  18. J

    Mercruiser 3.0 PCM-09 Code 3050

    yes, apparently sucker is written in large letters on my forehead.
  19. J

    Mercruiser 3.0 PCM-09 Code 3050

    Major lesson learned, never buy a boat without sea trial and never buy a used boat without a diagnostic kit for the engine... costly lesson but at least learning did occur.
  20. J

    Mercruiser 3.0 PCM-09 Code 3050

    Yes I am the sucker on this, bought the boat without sea trial. The boat would not start, I looked at it and immediately saw the distributor was 180 out and noticed a few other minor issues that I knew needed attention, prior owner had just finished rebuilding the engine he said, showed me all...
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