2003 90 Mercury Starter won't turn off.

[iknight1]

Hey guys,

Brand new member/boater here. I have a 2003 90hp Mercury and the starter will not turn off. To make it even more confusing when i turn on the batteries the engine automatically tries to turn over without me even having the key in the ignition. Please help.

 

[MH Hawker]

Re: 2003 90 Mercury Starter won't turn off.

The contacts in the solenoid are welded together.

 

[iknight1]

Re: 2003 90 Mercury Starter won't turn off.

The contacts in the solenoid are welded together.

I apologize for my stupidity ahead of time.

I take it if i replace the solenoids my problem should be solved.

 

[iknight1]

Re: 2003 90 Mercury Starter won't turn off.

The contacts in the solenoid are welded together.

And which solenoid are you talking about? the big starter solenoid or the small one?

 

[iknight1]

Re: 2003 90 Mercury Starter won't turn off.

 

[MH Hawker]

Re: 2003 90 Mercury Starter won't turn off.

That would be the # 1 in your picture. Before you replace it, test it first, You test it with no power on and by taking a VOM on the ohm setting and disconnect one of the big power leads, then take the VOM probes and measure between the big power posts. The correct reading should open, thats no reading at all, if the internal contacts are welded closed it will give you a reading of some sort, more than likely 0 to 5 ohms.

 

[iknight1]

Re: 2003 90 Mercury Starter won't turn off.

That would be the # 1 in your picture. Before you replace it, test it first, You test it with no power on and by taking a VOM on the ohm setting and disconnect one of the big power leads, then take the VOM probes and measure between the big power posts. The correct reading should open, thats no reading at all, if the internal contacts are welded closed it will give you a reading of some sort, more than likely 0 to 5 ohms.

Thank you very much for the information. I really appreciate it.

 

[AChotrod]

Re: 2003 90 Mercury Starter won't turn off.

My Johnson did that right before the starter solenoid took a crap.

 

[iknight1]

Re: 2003 90 Mercury Starter won't turn off.

That would be the # 1 in your picture. Before you replace it, test it first, You test it with no power on and by taking a VOM on the ohm setting and disconnect one of the big power leads, then take the VOM probes and measure between the big power posts. The correct reading should open, thats no reading at all, if the internal contacts are welded closed it will give you a reading of some sort, more than likely 0 to 5 ohms.

Just wanted to say thanks again. I replaced the solenoid this weekend and problem is solved.