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  1. A

    Mercruiser power trim 1979

    Disconnect the pump from everything Connect the pump direct to Bat using Blue and Black or swap feeds to Green and Black connections That is the gauge connection and has no effect on the pump running
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    4.3 Mercruiser Vortex

    Use a voltmeter and trace power 12V on Bat, then check starter, then check 50 amp breaker, then check slave solenoid. Go behind the helm with the key switch, check red/purple wire, turn key ON and is there 12V on Purple wire? When key is turned to start is there 12V on the Yellow/red wire? Let...
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    Boat engine overheated and cut out.

    You blew a head gasket or cracked the head. Pull the head and inspect and hope it's just the gasket and not a cracked head
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    5.7l Black Scorpion intermittent starting

    Apologizes to Makomark, it doesn't matter if it;s a Scorpion or not, they work the same. 06 Enzo, as mentioned you should NOT see 12V on the small terminals terminals with key OFF or ON. Should only see 12V when key is turned to start. If you see 12V on both sides with key turned to start, this...
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    5.7l Black Scorpion intermittent starting

    How are you placing your meter probes when measuring?
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    93' OMC 5.0 EFI - Struggling with hot starts, sagging drive and overheating at idle.

    My guess is your sucking air somewhere Get some clear tubing from the hardware store, double barbed fittings and hose clamps. Make some short pieces of the clear tubing and place them inline with intake hose to thermostat and other areas. If you see bubbles when in the water your sucking air...
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    93' OMC 5.0 EFI - Struggling with hot starts, sagging drive and overheating at idle.

    Overheat at idle, replace the water pump impeller and see if the pump housing also needs replacing Drive sagging, means the trim pump or trim cylinders are leaking, need rebuild, most likely it's the cylinders Hot restarts, do testing. Check fuel pressure, look at the plugs, cap, rotor. What...
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    5.7l Black Scorpion intermittent starting

    My comment was that he should see 12V on both sides of the coil with key ON and not turned to start position
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    5.7l Black Scorpion intermittent starting

    Agree
  10. A

    5.7l Black Scorpion intermittent starting

    Guess we will agree to disagree This is non-MX Scorpion wiring, note the direct ground
  11. A

    5.7l Black Scorpion intermittent starting

    May have found the issue 1. Does your boat have a transmission? With the Black Scorpion MX this can be correct. Normally the neutral safety switch is in the throttle handle, but the Scorpion has a switch in the trans. So instead of one side of the slave relay being always grounded, the ground...
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    Vortec 4.3 v6 start and stops

    Serial number of the motor? What is the fuel pressure your seeing?
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    Bravo III Outdrive "slipping"

    I think the coupler tore When was the last time the drives were pulled and alignment was checked? Most don't do this and after enough time things change This is probably a large boat and if your one that runs the blower when running you may never smell rubber. Open engine hatch, have someone...
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    5.7l Black Scorpion intermittent starting

    Need a helper, but when it's not cranking check power on the small Yellow/Red wire on slave solenoid. Might also be a bad connection
  15. A

    Mercruiser power trim 1979

    Single solenoid wiring
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    growling noise coming from rear-end sounds like someone grinding gears in a car

    Droid brings up a good point, what year is the boat and what drive are your discussing. If it was a 40 yr old boat with a Merc drive that wouldn't be as much of an issue as a OMC Racerone brings up another good point
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    1976 Ford 302 trailer wiring

    I have no idea why trailer wiring is designed to use the trailer frame as ground, running a ground wire is not that hard, but it is what it is Your motor has nothing to do with the question your asking, the type of boat is. I'll assume for now it's a 20ft something boat. Mount some poles on...
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    5.7l Black Scorpion intermittent starting

    Welcome If you mean where you turn the key and the motor doesn't crank, than it's most likely the neutral safety switch in the throttle control. Turn key to start and move the throttle forward or reverse slightly, it should crank up
  19. A

    Transom saver

    Question: When the boat is out of the water and the OB is full down will it touch and is there any distance above the ground?
  20. A

    Difference between 8M0094923 and 8M0083396

    Don't know for sure but my guess is the 8M00833396 is a over seas part only. I'm unable to find the number at Mercury or other parts places. Did find the part on ebay The 8M0094923 can be found at Mercury and other places
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