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  1. alldodge

    1973 mercruiser 120 HP no spark

    Not correct Points go to negative side of coil The "condenser" should be inside the distributor and connected to the points Should be 2 wires on positive side of coil White (but might be Brown) and a Tan. White goes to key and Tan should go to starter solenoid Remove both wires and turn key...
  2. alldodge

    1973 mercruiser 120 HP no spark

    The voltage readings are backwards. Should see full 12V when cranking which bypasses the resistance wire (or ballast resistor). Turned ON it should be around 9V because it should go thru the resistance wire. Putting a ground wire on the - side of coil will keep the coil from ever firing...
  3. alldodge

    Mercruser 1898 5.7 with thunderbolt ign problem

    The 3 wire pickup module is the correct one. The extra wire is for ground Have you checked compression? Did this just start happening?
  4. alldodge

    My boat is being a boat . . .

    Double post some how
  5. alldodge

    My boat is being a boat . . .

    As time goes along and you find that your mileage is dropping might want to check those spaces and just how much stuff ya got in there ;)
  6. alldodge

    What am I looking at?

    Pull fuses out one by one and read what is stamped on the fuse
  7. alldodge

    1973 mercruiser 120 HP no spark

    I'll assume you have points ignition and has not been changed Need a voltmeter and see if your getting power on the + side of the coil when key is turned ON. Then check for full 12V on + side of coil when it's cranking
  8. alldodge

    Should I be worried

    Trailer is not long enough for the boat. The transom needs to be supported
  9. alldodge

    Slipping out of gear when speeding up

    What did the shop do? If they changed the lube and impeller they may or may not have checked alignment Did you smell burnt rubber when it lost power? Go to the prop and use mark the prop and nut with with grease pencil, splash of paint or other method. Take boat for another run and then...
  10. alldodge

    Slipping out of gear when speeding up

    Probably spun the coupler or prop hub When was the last time the alignment was checked?
  11. alldodge

    5.0 Gxi-ce 270-r misfires cyl 4&7 at full throttle

    Don't see plugs doing this unless the new plugs (4 and 7) look different then others. Can check gap but don't try to adjust them, Iridium coating can be damaged I would suspect the cap before other things. You replaced it, but was it a VP, Merc or GM Ac Delco and not aftermarket? Swapping...
  12. alldodge

    ECM for 1999 Mercruiser MCM 5.0L EFI / 305 CID

    Yes you have a EFI (Electronic Fuel Injection) motor, it's TBI (Throttle Body Injection) with TB5 (Thunderbolt 5) ignition
  13. alldodge

    Trim tab location

    Tabs work best when they are close to the outside edge. Placing them near the props will give little help and can cause the prop to ventilate
  14. alldodge

    Mercruiser 3.0 starter

    Ground case, 12V Bat to post, small wire jump from post to post on right
  15. alldodge

    New impeller but now no cooling

    Guess I have nothing then unless there is some groves in the pump housing
  16. alldodge

    New impeller but now no cooling

    Hey @Scott Danforth was the F5 pump used on the GL?
  17. alldodge

    New impeller but now no cooling

    Which impeller kit did you get?
  18. alldodge

    New impeller but now no cooling

    Agree VP with crank mounted pump, intake hose will be on top
  19. alldodge

    New impeller but now no cooling

    ^^^ Agree If its a Bravo intake hose is on the bottom
  20. alldodge

    ECM for 1999 Mercruiser MCM 5.0L EFI / 305 CID

    Go figure, I plug in your serial number and it takes me to an older model and does show it's not in your series. Websites, have to double check them also, and it's coming from Merc OK TB5, TBI and MEFI 3 Need to get the motor timed, then see it that fixes the issue
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