W@iring Mercruiser slave solenoid issue.

[Rranger]

Putting a mercruiser 5.7 l (1988ish) in a boat that had a a old mercury setup in it. Am having problems with the slave solenoid. If I bypass the solenoid totally with my ignition wire direct to the starter solenoid it starts like a champ. With my battery hooked direct to the slave solenoid and out the other side of the slave solenoid to the starter solenoid, and ignition power to one small post on the slave solenoid and a good ground on the other small post, I'm getting no power through to the starter. I get no clicking nothing. If I jump the solenoid from one side to the other it starts like a champ.



I followed Don's instructions as per the following

"""Hook up your test light again with the clip on a good ground. Now touch terminal C of the slave solenoid with your test light and have your helper turn the key to the start position again. The light should light up? If it did, touch your test light on terminal A, if it lights, hook your test light lead to it, and put the probe on terminal D (the ground) if it doesn't light, then you have a bad ground for the slave solenoid and without that ground the slave solenoid will not work."""

When I hook A to D my light works, so I have a good ground.

Solenoid clicks during bench test.

I thought it might be a neutral safety issue but at all times I get ignition power to the small post on the slave solenoid when I activate the key in gear or not. Basically at a standstill.
Also I have a purple wire with a yellow stripe appearing out of the wiring harness that I'm not sure of its purpose, any help on that?

Thanks

 

[Bt Doctur]

You don't hook a battery to the slave solenoid.. With 12v applied to the small lug the slave should operate and trigger the main solenoid.
If not, short the 2 large slave solenoid lugs, starter turns= slave is no good.

 

[alldodge]

Putting a mercruiser 5.7 l (1988ish) in a boat that had a a old mercury setup in it. Am having problems with the slave solenoid. If I bypass the solenoid totally with my ignition wire direct to the starter solenoid it starts like a champ. With my battery hooked direct to the slave solenoid and out the other side of the slave solenoid to the starter solenoid, and ignition power to one small post on the slave solenoid and a good ground on the other small post, I'm getting no power through to the starter. I get no clicking nothing. If I jump the solenoid from one side to the other it starts like a champ.



I followed Don's instructions as per the following

"""Hook up your test light again with the clip on a good ground. Now touch terminal C of the slave solenoid with your test light and have your helper turn the key to the start position again. The light should light up? If it did, touch your test light on terminal A, if it lights, hook your test light lead to it, and put the probe on terminal D (the ground) if it doesn't light, then you have a bad ground for the slave solenoid and without that ground the slave solenoid will not work."""

When I hook A to D my light works, so I have a good ground.

I thought it might be a neutral safety issue but at all times I get ignition power to the small post on the slave solenoid when I activate the key in gear or not. Basically at a standstill.
Also I have a purple wire with a yellow stripe appearing out of the wiring harness that I'm not sure of its purpose, any help on that?

Thanks

Your battery does not get connected directly to the slave solenoid.
Battery positive to starter terminal
Yel/Red (Smaller wire)from harness to small terminal on slave solenoid
Black wire on other small terminal of slave
Yel/Red (larger 10AWG wire) from large terminal on slave to starter solenoid post
Red/Pur (large 10AWG wire) from harness to other larger terminal on slave

Pic below is one type of slave solenoid. You could have the large post which are on each side, it will be wired the same

Thie lower pic is to show starter connections only. No reference to fuel pump

 

[Rranger]

I can't view your pics for some reason they have a X in the pic box??
My bad the large red (no red/purple wire.) wire off my harness is hooked to the large post on the solenoid. Battery post is to the starter. I've tried a couple of solenoids including a brand new one that is going back this morning. Neither one worked. Hopefully that's the problem.

Also I have a purple wire with a yellow stripe appearing out of the wiring harness that I'm not sure of its purpose, any help on that?

 

[alldodge]

I can't view your pics for some reason they have a X in the pic box??
My bad the large red (no red/purple wire.) wire off my harness is hooked to the large post on the solenoid. Battery post is to the starter. I've tried a couple of solenoids including a brand new one that is going back this morning. Neither one worked. Hopefully that's the problem.

Also I have a purple wire with a yellow stripe appearing out of the wiring harness that I'm not sure of its purpose, any help on that?

Pics here at iboats are a crap shoot. Today one of my pics showed up the other had an X, uploaded the other again :facepalm: We all hope someday it will get better.

The Pur/Yel wire is used as a bypass during starting (while cranking). It applies 12V to the electric fuel pump (if equipped) during cranking. If you don't have an electric fuel pump it will not be used.

Don't see you having two bad solenoids, I think you still have something wired incorrectly. Take some pics and upload them to something like photobucket and post back of what you have

 

[Rranger]

It was terrible luck with solenoids exchanged new one i bought for another and varoooom... thanks

 

[Rranger]

Exchaned new solenoid for a new one installed and ran like a champ thanks all

 

[Rranger]

Exchanged new solenoid for a new one installed and ran like a champ thanks all