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  1. C

    Humming/ Buzzing in dash

    Not sure what you want. Either the gauge is set to alarm at 2 feet, or the electronics are bad. The first test is to turn off the alarm off. The OEM web 'site may have a manual. If that doesn't work, and the gauge works correctly otherwise, kill the buzzer and see how it goes.
  2. C

    high idle

    If the thermo valve is not closing after warm up, or the vacuum hose to it is leaking, the idle RPM would be high.
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    Older Merc 150 2 stroke really rough below 3000 RPM

    It sounds like you are on the right track. The carb model of that year looks to have std carbs on it. Each carb will have a idle mixture screw for each barrel. There should be carb kits both OEM and after market on the web.
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    Mercury 150 xl 2 stroke, carbureted, head temperatures vary by 15 to 25 degrees

    Gee, what is the issue?
  5. C

    high idle

    Some of those motors have a thermo valve, which allows extra air to raise revs. You might see if it is working. Trace some vacuum lines to the head.
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    Humming/ Buzzing in dash

    OK, don't believe me.. I see 2.0 feet on the gauge.
  7. C

    Carpet glue

    Gee, scrape off any build up.
  8. C

    4 blade to 3 blade, speed?

    6300 RPM is a bit high for a production engine.
  9. C

    184 MA draw on main battery cable

    Those Mercruiser PTT systems have a trim limit switch. They are open to the water, and therefore rot out. So repair the switch, if even possible, get used to using the trailer button to trim up, or wire the trailer button to the trim up switch...your choice.
  10. C

    Humming/ Buzzing in dash

    Sounds like a shallow water alarm. See if you can reset the low water alarm threshold, or turn it off.
  11. C

    184 MA draw on main battery cable

    Some Mercruisers have repressed current systems to protect against galvanic corrosion. These use some small current when boat is moored.
  12. C

    1150 Link & Sync Question

    OK, well for that size boat, that 2.5MGP seems pretty good. The flatter bottom helps with efficiency. Make sure the tilt pin is on the lowest setting. With a tach and a GPS you can maximize the efficiency. I would expect the whale tail to rob you of speed and efficiency, as it adds drag. If...
  13. C

    Humming/ Buzzing in dash

    That is good, but the alarms do not run off the gauges. They run off separate sensors....
  14. C

    Coolant in 3 cylinders after winter storage? Hasn't been started

    Well, you either have a cracked block, cracked head, rotted out riser or bad gasket between the manifold and riser. Hopefully the latter. Drain and pull the risers. s/b 4 bolts and a couple of hose clamps each. Inspect the gasket surface and try to see if the orange A-F breached the gasket...
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    Humming/ Buzzing in dash

    A lot of MerCruisers have a warning horn for overheat and loss of oil pressure. If you turn the ign key on and don't start the motor, after a few seconds, the no oil pressure horn will sound. Is it the same one?
  16. C

    Procedure to test Stator on Mercury

    You might disconnect the black/yellow wire at the switchbox. That will remove the ign keyswitch and wiring from the test. If spark returns, troubleshoot the ign keyswitch and wiring.
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    Coolant in 3 cylinders after winter storage? Hasn't been started

    Do you mean MerCruiser Sterndrive or straight inboard motor? On the Mercruiser, did you drain and fill the manifolds and riser with A-F? Presuming the manifolds and risers are not damaged, the gasket between the manifold and riser can leak, causing A-F to run into the engine thru an open valve.
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    Procedure to test Stator on Mercury

    Those are all ohm tests with the engine off, and the rectifier disconnected, and are for motors with ADI ignition. What are you working on? Did you test spark with the black/yellow wire disconnected at the switchbox? That is the first test for ADI motors. If you have battery powered CDI...
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    1150 Link & Sync Question

    2.5MPG s not bad for a 2 cycle motor of that HP. My '77 Merc 1500 on my 16 foot speedboat burned 6 Gal in 20 min, at full throttle, with a heavily loaded boat @ about 50MPH. What length boat and what prop pitch do you have? Unfortunately porpoising has a lot to do with the design of the hull...
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    Coolant in 3 cylinders after winter storage? Hasn't been started

    Exactly what motor are we discussing? MerCruiser sterndrive, outboard?
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