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    1978 Mercury 1150 wiring schematics

    Try the maxrules web site. A 1978 motor may have a set of unique wire colors, as they changed the wire colors in about that year.
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    Mercontrol Rewiring

    You can likely get a new keyswitch and choke button. Perhaps a new neutral safety switch. I had a control like that one, and needed to rewire it one day. Hopefully the mechanical bits are still good. The issue is that the quick disconnect boat harnesses go bad, and I do not know of a...
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    60Hp Mercury Tilt/Trim Not Working

    The primary power necessary to power the relays is likely 3Amps. So set the multimeter to 10A scale, and see what your wires put out.
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    Best boat lettering removal?

    Get the letters off anyway you can. A heat gun plus a plastic scraper can help. Remove the excessive adhesive with acetone.
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    60Hp Mercury Tilt/Trim Not Working

    Not sure what else to add. Relays need to provide either ground when not energized or power to the PTT motor when energized. Perhaps the primary winding is not getting enough amperage to energize the relays? I would find a up or down primary wire connection as close to the relays as...
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    Mercury 900 no spark

    There is an ignition test for those motors at the CDI Electronics web site. It assumes the coil is good, and tests the battery-powered CDI switchbox and wiring. It does not test the trigger, but tests all other components. I suggest you run this test. If no spark during test, the switchbox...
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    60Hp Mercury Tilt/Trim Not Working

    I sincerely doubt that you have an issue never seen before. PTT systems are pretty simple, once you get familiar with them. OK, by jumpering each relay at a time, you seem to have eliminated the heavy power and ground wire corrosion. Now you need to check the relay primary circuit. Since you...
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    Please help cant find wiring schematics/diagram for 86 mercury 150 XR2 serial number 0B199676

    Crowleymarine has parts diagram for your motor. It might help you to look up your charging system. Merc went from a simple full wave rectifier charging system, to a single 40A VR and then to twin 20A VRs for their 135 - 150HPV6 motors. My '93 Merc 135HPV6 has the twin 20A VRs. Earlier...
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    60Hp Mercury Tilt/Trim Not Working

    OK, you changed the trim switch and the relays, and jumpered the PTT motor. The motor works when jumpered, but not when using the switch and relays. Relays have light duty wiring to their primary windings. Since the relays click, this wiring is likely good. You also know the PTT motor is...
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    Is it worth to fix, replace t & t pump on a 87 merc 150 with 80 compression???

    If the cylinders all show about 80PSI, there is a real good chance that your compression gauge is inaccurate. There is very little chance that all the cylinders wore down exactly the same amount, to lose 30% of their expected compression. The sign of motor health is all cylinders being about...
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    NGK BUHW 2622 spark plug replacement?

    I don't even clean mine. I replace them when the shells get rusty.
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    very cool carb and intake manifold causing moisture

    You know, there are hundreds of perpetual motion machine designs on the internet. Of course, perpetual motion is impossible, but that does not stop the internet from pretending it is possible and even promising free energy to anyone who used their perpetual motion machines. It really reminds...
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    Please help cant find wiring schematics/diagram for 86 mercury 150 XR2 serial number 0B199676

    What does the maxrules web site have for your motor?
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    Mercury XR6 150

    Gee, open the idle mixture screws on the carbs to richen them a bit and see if that helps with acceleration.
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    Where to get alternator for Mercruiser?

    You can get one from Amazon w/o issue, I would think. Make sure it is a marine alternator, as they are shielded from making sparks in your bilge, which is real important. I used to have my local auto parts shop order a marine alternator out of their Sierra Catalog, when I needed one for my...
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    Mercury 900 no spark

    Voltage on the red wire should be +12VDC. It is a direct connection to the battery. It sounds like you need to clean those connections. Is the engine wiring harness still good? Most are losing their insulation by now. Cap electrode and spring are maintenance items. Cap and rotor are not...
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    1992 Johnson outboard not getting fuel.

    First connect the motor to a portable tank with a 50::1 gasoline/oil mix, just in case the VRO pump is not working properly. Now, if you pump the primer bulb, will the motor stays running? If so, the VRO pump is not working properly. An air leak into the fuel line will cause that, among other...
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    Bottom end soot

    OK, looks to be a johnnyrude. Check the part diagram for that motor at crowleymarine or other site and see if it has a seal where the exhaust housing contacts the gearcase. It is easy for it to move out of position. Part #21...
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    How to plan a route? is there an app like trip advisor?

    Or you could look at the charts and plot your own route. Most GPS have a route feature, but you need to add the waypoints. Worse comes to worse, you will learn about the water conditions, buoys, channels etc. on your route. Not bad knowledge to have, when something unexpected happens.
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    1981 Mercury 75hp water pump question

    I am not sure what you mean. The waterpump base has an oring and a gasket that seals the gearcase. Pick the right ones and grease them. Put the right gasket on the waterpump base and install it. A couple of nuts might be required to seat it into the gear case. The waterpump base should be...
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