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Author Topic:   Merc 4-cycle wiring
skred posted 10-03-2002 01:21 PM ET (US)   Profile for skred   Send Email to skred  
Can I get a "map" from Mercury Marine of the wiring coming off my new Merc 50 4-cycle, or should the dealer be able to supply that?
I need to know which are the tach connections (Purple?) and which are trim/tilt wires. There's nothing in the manual, nor in the "setup" booklet that came with the engine.
jameso posted 10-03-2002 03:47 PM ET (US)     Profile for jameso  Send Email to jameso     
Go to dealer and ask for a rigging diagram, or a wiring schematic.
Find it hard to believe that Merc does not include that info, but then it would also depend on which harness and controls you have. BUT the color of wires and their purpose should be same.
Jim Armstrong
jameso posted 10-03-2002 03:48 PM ET (US)     Profile for jameso  Send Email to jameso     
Aren't you putting this on a classic 15? If so I will anxiously await performance figures.
Jim Armstrong
skred posted 10-03-2002 04:47 PM ET (US)     Profile for skred  Send Email to skred     
Jim,

I've already had it installed and it's broken in. I love the quiet. My 15 CC with close to 5-600 lbs payload showed 39 mph on GPS at WOT, but not trimmed out completely. At one point, the mechanical speedometer (new) read 45 mph.
It's got a 12 pitch prop, so I suspect it could do a lot better pitched up a notch or two. I'm pretty satisfied as-is, since 40 mph is really sailing in a 15 CC.
Gas mileage is amazing so far: run out 1.5 miles at 80% throttle, troll 4 hours, run around another 2-3 miles at 80%-100%, troll another hour, run back at 80-95% throttle, and I used 2.2 gallons. Gotta like that.
I haven't got the bottom paint off yet, and it's really rough and oxidized, although the gel underneath the paint is not sanded or roughed up, etc. I think removing this paint and polishing the hull will add some to performance also.
I did notice that after running a while and shutting down, that when I restart, it doesn't want to idle nicely, but I think that's a dealer adjustment.
Still gonna take it up to Door County for the "parka & mukluk" rendezvous on 10/11-13.

PaulVT posted 10-08-2002 09:24 PM ET (US)     Profile for PaulVT  Send Email to PaulVT     
Skred,

I'd recommend getting the service manual for your engine if the dealer doesn't answer your wiring questions. You can order them online and they'll be shipped to your dealer if they don't stock them.

My manual covers '95-'00, and from it and some investigations:
The purple wire is +12V switched on by the key to power the instruments, connects to harness plug 2 inside the cowling.
The tach signal is gray in my harness, green/white inside engine cowling, pin 5 in the harness plug.

Paul

dgp posted 10-09-2002 08:59 AM ET (US)     Profile for dgp  Send Email to dgp     
skred, I just direct emailed you the wiring diagrams for the Mercury 50HP 4 stroke engine.
skred posted 10-09-2002 10:56 AM ET (US)     Profile for skred  Send Email to skred     
DGP,

My e-mail address should be updated on this site, but I don't know how. Email me at dwamse@milwaukee.gov

dgp posted 10-09-2002 11:04 AM ET (US)     Profile for dgp  Send Email to dgp     
Sent it to the new email address. You can update by entering the "profile" section at the top of the page.
skred posted 10-09-2002 11:09 AM ET (US)     Profile for skred  Send Email to skred     
Figured out updating my profile finally...!

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