Mercrusier 5.7L starter slave solinoid

[grewvin1]

Wellcraft 1987, 5.7L merc. turn the key and starter slave solinoid clicks but starter won't go, turn key a couple of times then starter goes, starter solinoid or slave solinoid? All wire connections have just been cleaned pos. and neg. all 1,000 of them.

 

[mark1905]

Re: Mercrusier 5.7L starter slave solinoid

What happens when you put a screwdriver across the large terminals of the slave solenoid? Engine turns over but it won't with the key?

If so, then it's that.

 

[Don S]

Re: Mercrusier 5.7L starter slave solinoid

What happens when you put a screwdriver across the large terminals of the slave solenoid? Engine turns over but it won't with the key?.

Jumping across the 2 big terminals will only spin the starter, not crank the motor.
Here is how you test the system to find the problem. http://forums.iboats.com/showthread.php?t=167035

 

[mark1905]

Re: Mercrusier 5.7L starter slave solinoid

He's just trying to spin the starter, not fire the motor.


(I mean yeah.. he'd like to start the motor, obviously.. but the problem at hand is the starter. Re-read the OP )

 

[Don S]

Re: Mercrusier 5.7L starter slave solinoid

He's just trying to spin the starter, not fire the motor.

I would think he wants the starter to crank the engine over, not just make noise while the starter motor spins. The solenoid could be inoperative and your test would spin the starter. :facepalm:
The solenoid has to work in order to engage the bendix into the flywheel.

 

[mark1905]

Re: Mercrusier 5.7L starter slave solinoid

That's why I'm telling him to test this:

..and not this:



Is that wrong? Any time that I've ever had a starting issue, the simplest way to see if it's the starter or the slave is to pop a screw driver across those terminals.. after all battery connections are checked and re-checked. If the motor turns right over with no problem, it's the slave. If the starter just clicks or still won't go, it's the starter. Done deal.

 

[Don S]

Re: Mercrusier 5.7L starter slave solinoid

Oops, my mistake. I thought I read starter solenoid. :redface:

 

[mark1905]

Re: Mercrusier 5.7L starter slave solinoid

Oops, my mistake. I thought I read starter solenoid. :redface:

Whew.. you had me questioning my own logic there for a second! We all have our moments.. and god knows you of all people are allowed infinite passes on them with all boat help karma notches on your belt by this time..

 

[grewvin1]

Re: Mercrusier 5.7L starter slave solinoid

Thanks guys have the print out on checking starting system thanks Don will do the test tonight. Had the same issue last night turn key and no click, stated other engine then the non start did start??? again checking system tonight.

 

[nola mike]

Re: Mercrusier 5.7L starter slave solinoid

If the motor turns right over with no problem, it's the slave.

Or a problem upstream of the slave (no power from the ignition to energize the slave) could do this as well, right?

 

[Don S]

Re: Mercrusier 5.7L starter slave solinoid

Or a problem upstream of the slave (no power from the ignition to energize the slave) could do this as well, right?

He has a click, so some power is getting through. Maybe not enough voltage to engage the solenoid (Corrosion/loose connections will do that).