2003 Mercury 25hp Bigfoot tach/trim wiring, need help please.

fishon1213

Petty Officer 3rd Class
Joined
Aug 10, 2009
Messages
80
I started installing a 2003 Mercury 25hp Bigfoot on a boat. I just purchased both of them. The motor is mounted on the boat, starts and runs, trim works on side of motor and controls. I have a tachometer and trim gauge that I would like to hook up. The first picture is of the motor showing the additional wires coming from the 8 pin connector to the motor. Blue/white and Green/white are hooked up, what about the remaining wires, what are they? The second picture is of the wires coming from the controls which are quicksilver controls, to the console/gauges. I have gauges to hook up, if someone could identify the wires for me I could probably figure out where they go. Also in the third picture, what is this plug with black and blue wires?


 

gm280

Supreme Mariner
Joined
Jun 26, 2011
Messages
14,605
I have no idea :noidea: but it sounds like it is time to buy the manufacturer's shop manual for that engine. It will have every schematic diagram you'll want or need... JMHO!
 
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