Ignition stays on

[Assassin]

Totally plausible as a solonoid is essentially a very large relay with huge contacts to handle the large currents associated with a starter motor.

It may be stuck as they are an electromagnetwhich engages when powered, and a spring return which disengages it when no power is applied.

It may also be another problem which is arcing of the contacts, if these arc up over time, as they all do, they build up crud on the contacts, all contacts have an air gap which is the gap between them when they are open, if the crud builds up over time from continual arcing it closes this air gap until it reaches a point where electricity is conducted at all times irrespective of whether the solonoid is energised or not and the real giveaway is the engine cranks slower than normal due to this crud creating a high resistance.

 

[faxi]

Totally plausible as a solonoid is essentially a very large relay with huge contacts to handle the large currents associated with a starter motor.

It may be stuck as they are an electromagnetwhich engages when powered, and a spring return which disengages it when no power is applied.

It may also be another problem which is arcing of the contacts, if these arc up over time, as they all do, they build up crud on the contacts, all contacts have an air gap which is the gap between them when they are open, if the crud builds up over time from continual arcing it closes this air gap until it reaches a point where electricity is conducted at all times irrespective of whether the solonoid is energised or not and the real giveaway is the engine cranks slower than normal due to this crud creating a high resistance.

Which is the right solenoid for my engine?

 

[VicS]

I have received new switch and the letters are different as per picture attached. Have I been given wrong one?

My friend who know a little about electric stuff disconnected the big red connector and as soon we put battery connection on the boat tried to start.
Then we disconnected the solenoid and it was ok. He said the solenoid is stuck. Does that make sense?
The new switch has an ‘I’ as an extra letter on back. Any light on that.

ITYWF that the new switch is an aftermarket replacement which is suitable for a greater range of applications. Ignore the "I" terminal it is for battery powered ignition systems
Connect the wiring to the other terminals as they were on the original switch

 

[VicS]

Which is the right solenoid for my engine?

I have found several numbers for the solenoid
Originally 0395419
replaced by 0582708
replaced by 0586180

Also Sierra 18-5808 and Arco SW622

Quote the full engine model number to your dealer when ordering, to be sure you get the right part, in case the Belgium made engines are different to the American made ones.

 

[Assassin]

VicS is correct, they are different.