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Author Topic:   Starter Problem
Gavin posted 07-14-2007 05:28 PM ET (US)   Profile for Gavin   Send Email to Gavin  
I am having a problem with Mercury 351w carburetor motor and have been out at least 10 times this season already, but, the other day I went to fire it up, and it fired up first turn, ran for about 20 seconds and then quit suddenly. I turned the key again and the starter made about a 1/4 revolution of the motor, and then seemed to power out, almost labored or not getting enough power,it did this about four more and then the solenoid on the starter began to engage and disengage very rapidly, it did this about 5 times and then quit completely. First I changed the battery, nothing, then I checked volts in and out of the master solenoid (4 prong) 12.5V going in, 0 coming out so I tried to jump the solenoid and could only achieve 1/4 motor revolution again. At this time the battery volts would drop to about 4V. New solenoid. All accessories are working. Still nothing from turning the key even though a 12-volt signal was coming to the master solenoid. Could my starter be drawing to much power, how do I check, Do you know what wires exactly should be on the solenoid I thank you for any other ideas you might have.
HAPPYJIM posted 07-14-2007 05:49 PM ET (US)     Profile for HAPPYJIM  Send Email to HAPPYJIM     
I would make sure that the battery has a full charge and try again. If that fails to spin the starter at full speed, pull the starter and have a motor rewind shop check it out.
Gavin posted 07-14-2007 07:32 PM ET (US)     Profile for Gavin  Send Email to Gavin     
If it is the starter why do you think it would kill the motor
Plotman posted 07-15-2007 01:48 AM ET (US)     Profile for Plotman  Send Email to Plotman     
Disassemble, clean, and reassemble your connections again. You can read 12v on dirty connections, but they may not allow the current needed to start.

This has happened to me.

jimh posted 07-16-2007 08:47 PM ET (US)     Profile for jimh  Send Email to jimh     
I recommend checking components in this order:

--the battery. In any battery operated system the first component to check is the battery. Be sure it is fully charged and has the necessary capacity to start te engine. The battery should not drop below about 10.5-volts no matter what load is placed on it by the starter motor.

--the wiring; Check all connections. Sand all terminals with extra find grit sandpaper to a clean surface.

--check for voltage drops in the system. There should not be more than about 1-volt drop between the battery and the starter motor. If there is more then there is excessive resistance in the wiring.

--check the starter motor. Sometimes the shaft of the motor can become bent and it will bind with the flywheel gear. This will stall the motor and prevent it from turning, and the motor will draw excessive current. Check the current draw with a clamp on ammeter.

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