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#1
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Phat, i purchased a dowloadable manual for the 1990-2000 2.5-275 Mercury/Mariner outboards, it was $8. If anybody wants, i can email you a copy of the manual, (i think??)
Still trying to verify some of the wires. I know one of these wires has to be for a warning horn for overheating, low oil etc. I did purchase the wire harness yesterday. It makes it much easier starting and killing the engine. So far i have not had to use the choke, it turns over for a half second then fires up, even after sitting all night. Also i ordered a new in box Mercury Commander Gen II binnacle control for $275. Now i need gauges, key switch, kill switch, warning horn, Teleflex Xtreme cables, and a hydraulic steering support shaft. Should i worry about the kill switch? I have never worn one, when on the boat with other people. But i have a feeling i will be doing alot of fishing by myself. On a side note, i can't find the trim sender on this motor. Is it a different design than the Johnson? On a side note, i don't think i have a trim sender on my motor. I can find one anywhere.
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1983 V-20 capsized. . . . in the garage. Last edited by jasoncooperpcola; 06-13-2012 at 07:44 PM. Reason: trim sender 
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#2
06-13-2012, 08:54 PM
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in the dia i have, the kill switch is the blk/yellow & black. this is in the side mount remote control units.
is the oil injection completely gone? no tank on motor or a blank plate where the pump goes. i might can come up with some pieces parts for that. i would still run premix since thats the way you got the motor. the trim indicator is a brown/white wire
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#3
06-13-2012, 09:02 PM
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Phat i have figured out the black wire with yellow stripe is for shut off, the red wire with yellow stripe is for starting. Yellow wire with black stripe is for choke, the brown wire is for the overheat sensors but on the outboard side of the connector its a brown wire with blue stripe. Purple wire runs into the motor and stops at a terminal block. Previous owner had it hooked to a fuel pump. Gray wire goes behind the coils into a black box so i think thats the tach wire. I have 12v between the red and black wires so they supply power forward to the ignition switch.
All i have left of the oil injection is the warning box. There is a blank plate over the crankshaft hole. I have no brown/white wire. Heck i dont even have a trim sender.  \Wiring diagram below, it would be nice if they labeled 1-8 on the connector with what they do. 
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1983 V-20 capsized. . . . in the garage. Last edited by jasoncooperpcola; 06-13-2012 at 09:41 PM.
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#4
06-13-2012, 10:33 PM
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what i am looking at is the diagram for the control box, so that might be the difference in the color codes. i think merc used different colors for different motors,but they all went to the 8 pin harness. i only have the manual for the 2.0, so that might be the problem.
sorry, not much help.
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#5
06-14-2012, 12:10 AM
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Looking at your engine while sitting in your boat, the tilt/trim sender is on your right, (port side) just about level with the top of the swivel. it looks like a small round black button, maybe an inch in dia and 3/4 of an inch thick. 2 small machine screws (either 10 x24 or 12 x 24) hold it in place. It has two wires coming out of it. One wire loops to one of those machine screws and is ground. it's about 4" long. The other wire connects via a push in connector to your wire harness and goes back, thru your harness, to your tilt guage.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#6
06-14-2012, 09:13 AM
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Phat you are a big help! The harness i got has diff wire colors. Will have to trace wires.
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1983 V-20 capsized. . . . in the garage.
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#7
06-14-2012, 05:14 PM
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Found a cowling for the Mercury.
 Going to get it Saturday and visit Family, that lives close. Destroyer, i could not find anything on the bracket that has wires except for the tilt/trim motor.
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1983 V-20 capsized. . . . in the garage. Last edited by jasoncooperpcola; 06-14-2012 at 06:03 PM.
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