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    1983 Mercury 50 HP 4 cylinder Electric Start Wiring Diagram

    Here is likely wiring diagram in color. https://maxrules.com/oldmercs/Wiring/1966ona/60.jpg If your wire colors match, then red is +12VDC; black is ground; blk/yellow is ign killer; yellow/black is choke solenoid; purple is power from ign switch; grey is tach signal; yellow/red is starter...
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    50 hp Merc 1985

    Look on the maxrules website for the wiring diagram and year. Your motor's serial no. looks to be a 1982. You probably have the new, common wire colors such as purple for ign power, but those 4-cylinder 50HP motors were really popular, so they were made the same for years after other models...
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    Bouncing Tilt and Trim on Way Down

    Well, bleed the unit, and grease the parts that move.
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    1979 Mercury 80 HP power trim

    The trim rams should retract all the way into the trim cylinders, when the motor is full up. At that point, you should be able to lift the gearcase by hand to use the manual locks.
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    Bouncing Tilt and Trim on Way Down

    Normally that is caused by the motor binding on the tilt tube or something similar. Grease the tilt rod, and make sure nothing else is binding.
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    1979 Mercury 80 HP power trim

    Merc850, I think he is well past the original wiring. He seems to have simplified it to a single switch and three wires. If his motor doesn't trim all the way under PTT influence, I would think it mechanical, or some other issue.
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    Fuel Pump for 1997 9.9 mercury four stroke

    I was unable to find a cross ref from your serial number to a Yammie. Take a couple of pictures of your motor including the powerhead w/o cowling. Go on the crowleymarine web site and work your way thru the yamaha 9.9HP motor parts diagrams of your year until it matches yours. Now see if...
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    Partial transom repair

    Watch the top corners of the transom for cracks. That is usually where they start. You going to junk the hull in a couple of years?
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    1979 Mercury 80 HP power trim

    Gee, jumper the up solenoid at the pump reservoir so it runs. See how high it goes. If not all the way up, something mechanical is amiss. Watch those dog ear-shaped manual tilt locks as they can bind up the triple clamp. Merc did make PTT units for lower HP motors, say the popular...
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    High-Speed Jet NLA??

    It sounds like the slot for the screwdriver is partially stripped. Normally that does not damage the jets. If the hole thru the brass jet is rough, that could be an issue. Some of those carbs have intermediate air orifices, w/o air filters. I have found that they can clog. You might clean...
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    1979 Mercury 80 HP power trim

    I did not really understand your post. However, wiring for your PTT system is real simple without the trim limit switch. The PTT pump/reservoir is connected by dedicated battery cables to the battery. The pump/reservoir body is connected to the ground cable, as is the black lead from the PTT...
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    Fuel Pump for 1997 9.9 mercury four stroke

    They seem to be pretty scarce. Here is one from the UK (I think). https://ouboaen.com/825470t One from Wisconsin: https://www.2040-parts.com/825470-fuel-pump-mercury-outboards-9-9-hp-4-stroke-1995-1998-i1380848/ Some rebuild parts are at Marineengine.com If truly a Yamaha part, you will need...
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    High-Speed Jet NLA??

    Gee, the main carb jet for your motor is: https://www.crowleymarine.com/evinrude/products/0328543-58d-orifice It is still D/C, so you would need to look at the used/junk parts arena. Why do you need new ones? They never wear out.
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    2019 4.3 Mercruiser/Alpha One Outdrive

    Normally the dia of a prop is set by the OEM, and you pick one based on pitch. I am therefore not sure how much choice of dia you will have. Your RPM and speed numbers are very unusual. Not many 4.3L engines can swing a 23P prop at 6000 RPM and only get 32MPH. I would think you need to...
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    1979 Mercury 80 HP power trim

    The purple and blue wires are for the trim limit switch. Your original PTT panel had the three buttons. Maybe the top button is bad? They are good quality switches, but not indestructible. You can pull the rubber off the switch and see and maybe repair it. You will need a heavy-duty...
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    Stripped threads on carburetor

    If you have sufficient room on the carb body, you could drill and retap for a flush bushing. You would need to find a flush bushing that fits the fuel line, and get the right tap and drill for the male part of the flush bushing.
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    My 1998 Seaswirl boat wiring harness has a lot of corrosion in the 12+ pin connector

    I am having trouble with the subject. The corrosion has restricted the power and likely ground at the connecter to the boat part of the harness. The engine harness seems fine. Are there any boat wiring harness plugs that are recommended to replace those. Do the pins for the replacement...
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    Trim pump wiring help

    Bartone, If I understood correctly, you have the older "pump/reservoir in the boat" style PTT system. Those systems have one or two solenoids. They often have a trim limit switch as well. Here is a pic of how the wiring came from the factory, on a one solenoid system. If you have two...
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    1998 115 (E115SLECM) VRO leaking fuel

    I had the same issue. My '98 Johnny OMS pump was leaking raw fuel. Being that it was 27 years old, I replaced it. Upon further review, the oring where the raw fuel line attaches was leaking.
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    No Power to Sparkplugs. Any advice appreciated

    On that ignition system, the magnets on the flywheel swing past the stator inducing voltage to the rectifier and the two switchboxes directly under them. The rectifier only charges the battery. The trigger under the flywheel tells the switchboxes to fire the coil and spark is produced...
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