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  1. M

    Tachometer reading off

    If you didn't play with the pole selection switch on the back of the tach. I would say you tach is done and needs replacing. If you tap the bezel of the gauge while the problem arises. Does the need sweep erratic. Or sweep to normal working order ?
  2. M

    Low fuel pressure 4 st 60hp 2010

    It's rare you would need to change the regulator. Is the fsm full of fuel ? There is a mechanical lift pump. And a float system. Have you checked to see if they are operational?
  3. M

    2007 mercury 2 stroke 2cyl elpto trim and tilt

    You can install another switch anywhere. You need to tap into the harness for the tilt and trim switch. RED is power 12v positive. BLUE is up wire. GREEN is down wire .
  4. M

    Mercury force motor trim issue

    Poppet valves inside hydraulic pump might be weak.
  5. M

    Mercury 75 ELPT 2003 wont shift forward to neutral under load.

    Most likely you have an issue in the gearcase, and will need to be opened to inspect inside.
  6. M

    Wiring Diagram Mercury 75hp

    The Grey wire coming from the rectifier feeds the tach. Be careful, it is ignition powered, you may get a nasty shock if you touch any bare wire, while the engine is running. The purple wire is the 12v feed for the ignition system ie the ignition switch. Radio feed , gauges etc.
  7. M

    Water running into the impeller housing unit when out drive is up but not when it’s down with the water hose and muffs on a 496 mag engine.

    Inspect the water hose from the bell housing to the outer transom assembly. It's either perforated or kinked
  8. M

    1992 90hp mariner flooding

    Index the flywheel. This will tell you if the ignition timing is correct. Or check flywheel key
  9. M

    2013 25 hp 4stroke efi.. bogging down 2 seconds runs fine 2 seconds??

    Correct me if I'm wrong. But mercury had a service bulletin about the 25hp efi running issues. The correction was a new ground wire from the ecm ground wire to the starter bracket. The ecm ground wire is next to the starter, all the small ground wires are in that bunch.
  10. M

    2004 Mercury 50hp 4stroke EFI won't accelerate.

    Assuming the vent is working correctly on your fuel tank. It could be a lift pump issue. Not supplying enough fuel vst. Now I do believe inside the vst tank, there is a float. Like in a carburetor. It meters the amount the lift pump supplies . If all else fails. Start from scratch. Do a...
  11. M

    175hp BlackMax tilt cylinder leaks down

    Inside the pump are 2 poppet valves. Both are replaceable. They hold the pressure for up and down.
  12. M

    1992 90hp mariner flooding

    Do your carbs have a mixture screw ?
  13. M

    1979 Mercury 1150 OB Cooling System Problems

    Could be your engine at one time overheated bad. Melting or distorting the water tube upper grommet. Your cooking system needs to be sealed to work properly. Now your cooling poppet valve or release valve could be open at idle, causing the water pressure to drop
  14. M

    1992 90hp mariner flooding

    It may not be a carb issue. More of an ignition issue. What color is the spark, at the spark plugs?
  15. M

    charging system on 2004 60 hp 4 stroke big foot not keeping battery charged what to look for

    Check fuse at voltage regulator , only if 1 exists. Otherwise check for battery voltage at red wire of voltage regulator engine off. Do you have a dva meter ? With a dva you can check high voltage output from stator while it's running. There are 2 or 3 yellow wires coming from the stator...
  16. M

    charging system on 2004 60 hp 4 stroke big foot not keeping battery charged what to look for

    You have 4 choices of why. Could be issue with stator or issue with voltage regulator. Or you have a defective battery . Or poor connections.
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