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    1978 mercury wiring harness adapter to new 8pin controls

    Hey I have a 1978 mercury 800 80 hp. The wiring harness is an old 6pin side cowling. I just bought a new 8 pin to 6 pin wiring harness adapter (part number 421-4401) and new mercury boat controls. I hooked up the controls and started the boat. I couldn’t get the boat to shut off until unhooking...
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    Replacing 1978 merccontrol with 6 pin

    Hey guys I was wondering if someone can help. I have a 1978 mercury with merc controls. The wire harness has some wires looking sketchy, was going to replace a couple of wires but instead I want a new harness and controls. I don’t see any 6pin controls. How can I turn my 6pin into an 8 etc. also...
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    Is My Wiring Harness The same?

    Hey guys been a year or so since i've been on here. I want to know if My merc control will fit a used engine im going to look at today. I have a 1978 mercury 800 80 Hp with the old style Merc Control. I'm going to look at a 1986 Mercury Mariner 80hp. Are the wiring harness's the same? Any help...
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    1978 mercury 800 80hp sputtering.

    It's me again. I have my first boat. Which I thought ran great. when I went to buy it. Heard it and didn't sound bad. However 2 months and 3 trips later i only get about 100 yards from dock to turn around and bring it back home to work some more. First time out found out it was only running on 2...
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    Top plug not firing 78 mercury 800 80hp

    Last night while fixing my boat (1978 sportcraft with 1978 mercury 800 80hp with mercocontrol) i started it up and my girlfriend's dad noticed it sounded a bit weird. He started taking the wires off while idling and top plug(cylinder) made no difference. The bottom 3 would shut the engine off...
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    1978 mercury 80hp with Merc control

    I recently changed my throttle/shift cables on my 1978 mercury 800 80hp. The cable barrels were already lined up with the old setup,however when I took it out on the water full throttle was only about 7 mph. It didn't kick in gear until about half throttle. Also the reverse lock wouldn't lock...
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    Me again. Had to turn around 100 yds from dock

    Hey guys I finally got my 1978 sportcraft with 78 mercury 800 80hp in the water yesterday after changing shift/throttle, steering cables. Changed gear lube also. A few problems which hopefully seem minor. Any help is greatly​ appreciated. 1. My mercury didn't have a tilt pin lock so me and my...
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    New helm new cables. Clicking noise.

    I have a 1978 sportcraft with a 78 mercury 800 80hp. I changed all of the cables. Shift/throttle, and steering. It's a rotary helm. I replaced helm also. The new helm bracket was straight. It didn't slant like the old one. I regressed the tilt tube. It took me awhile to figure out how to adjust...
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    Turning more one way than the other

    Without the motor hooked up I get 2 full spins of the wheel to the left but only 1 1/4 to the right. I can see the bar that goes through the til tube still has about 1 1/2 inches left that it can go in. What the hell is happening. I took the cable out of the helm about 3 times now. Do I tighten...
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    Sorry guys. Need help asap again. Shift/throttle cables

    Which bolt do I take off to get this top cable out?
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    In middle of working on steering right now. Please help asap.

    Working on my first boat. In the middle of changing my helm and cables right now. The new helm came with a 90? bezzle. (I believe that's what it's called) it's an x34 bezzle. The one on my original helm was a 20? bezzle. The x35. (If I'm wrong on the part name)then the new bezzle sits more...
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    Please help!? Shift cable/throttle cable?

    Please help,I'm new to boats. I just bought my first boat. Got a good deal. 1978 sportcraft with an original 800 80 HP mercury engine that runs good. However there are some minor repairs. One of them I noticed is a freyed rusted cable going to the engine. It has one right above it the same size...
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