20 Most Recent Mercury Outboards - Zinc Merc Outdrive Questions & Answers

The fat red wire will go to the input side of the solenoid along with the trim power on the same 5/16ths lug. the black is not power it is ground and the starter wire should be yellow with a red tracer, the start wire is connected to one of the two 1/8th inch connections and the ground goes to the other.
For future questions include your year and serial number. I could be way off if this is a 1970s model.

Mercury... | Answered on Oct 30, 2018

Your shifter cable is most likely almost out of adjustment. What I think your issue is .... Your shifter cable has stretched so neutral on your shifter isn't actually neutral on your motor. There is a safety system built into every boat motor that will not allow the motor to start while in gear ( think early cartoons of the guy flying over the back when he fires up his boat) if that switch is even slightly out of position then your motor will not even send a signal to the starter. Try resetting the cable to its proper position. Next check that ground wire on the motor and make sure it's tight.... The cables maybe moving the ground wire around.

Mercury... | Answered on Aug 01, 2018

Those motors have a sensor on the oil pump drive gear that senses the oil pump drive shaft spinning. That sensor could be going out giving a false code. You can take off the oil line exit on the pump and crank the motor up for no more than a minute to check for oil flow. It won't be much at all....a dribble is all you can expect on idle. The most common problem is the oil tank on the motor itself or the sensor probe in the tank. The float can fall off giving a false signal as well. Make sure the cap and hoses are tight on the remote oil tank as the motor pressurizes the tank to push oil to the motor reservoir.

Mercury... | Answered on Aug 20, 2017

check for leaks in the lift system...
clean the rams and after they settle... raise them back up and see if the seals there are defeated.

Mercury... | Answered on Mar 31, 2013

Sounds like a stuck thermostat- will your engine show a stream at the *** hole? You must also check your engine temp by splashing water on the power head and listen for sizzel. Have seen bad temp sensors.

Then of course- when was the pump changed last-- any dry starts or "blow the water out on the trailer" activity. All that will burn up a water pump.

If the pump is new. did they get all the old pump parts out of the motor? Those can haunt you for years.

Mercury... | Answered on Oct 14, 2012

That serial number was produced during the years of 1988 through 1990.

Mercury Boating | Answered on Oct 21, 2019

Take out the spark plug. Hold a drinking straw up to the spray nozzle and shoot the fog into the spark plug hole.

Mercury Boating | Answered on Sep 30, 2019

Depends on the HP of the motor. The long shaft will only ad a few lbs. See this link for motor specs on weights.


Mercury Boating | Answered on Sep 25, 2019

Best not to do it as you will get maybe 2 mph. Also, I believe it is ******* to modify 1996 and later motors.

Mercury Boating | Answered on Sep 09, 2019

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