Like Tree0Likes

Slave Solenoid?

Reply
Old 07-17-2007, 06:09 PM
  #1
Registered
Thread Starter
 
Join Date: Jun 2007
Posts: 4
Default Slave Solenoid?

1998 Baja 180 Islander w/5.7 liter 250 horse. What exactly is the purpose of a "slave solenoid" in the starting circuitry? Where would I find it, is it different from the solenoid on the starter itself? I occasionally get a no-start - nothing when I turn the key but the guages come alive and I can hear a faint clicking from the engine area. Battery tests good. I am replacing the battery cables because they do have quite a bit of corrosion. Any ideas? Could it be the ignition switch itself? Thank you for any of your thoughts.
Aero654 is offline  
Reply With Quote
Old 07-17-2007, 06:41 PM
  #2
Charter Member
Charter Member
 
Thunderstruck's Avatar
 
Join Date: Nov 2000
Location: Lake Charles, LA USA
My Boats: 1998 32' Active Thunder (Sold)
Posts: 1,094
Default

Follow the yellow/red wire from the starter solenoid up to the slave solenoid. It is usually somewhere near the ignition module area. The purpose is to avoid running large gage wires with associated current all the way to the dash switch. They are $30-35. Replace that one and carry a spare.
Thunderstruck is offline  
Reply With Quote
Old 07-18-2007, 05:25 AM
  #3
Gold Member
Gold Member
 
Iggy's Avatar
 
Join Date: Jan 2001
Location: Kissimmee, Florida
My Boats: '88 Formula F-206 LS
Posts: 4,155
Default

I never understood the reason for a slave solenoid either. Why use one solenoid to activate another solenoid?
You say it's there to keep from running large gage wire to the dash, but any solenoid only needs a 12V low amp signal to activate. I can activate a starter solenoid with a piece of 14 or 16 gage wire.
Iggy is offline  
Reply With Quote
Old 07-18-2007, 07:43 AM
  #4
Registered
 
Join Date: Jun 2007
Location: Denton, TX
My Boats: 1988 Chris Craft Stinger 415
Posts: 109
Default

On our race car, we have to run a slave solenoid (a relay in our case) because the ignition switch itself is incapable of reliably passing the 3-4 amps that the starter solenoid requires.

Seems that this may be the case on the boats as well?

Greg
point92mach is offline  
Reply With Quote
Old 07-18-2007, 07:48 AM
  #5
Registered
 
Join Date: Nov 2000
Location: Glastonbury, CT
Posts: 882
Default

I had the same problem in my Donzi a click, it was the slave soleonoid. Its wasy to rplace so do it. I have no idea what the purpose of it was.
boomer is online now  
Reply With Quote
Old 07-18-2007, 08:05 AM
  #6
Registered
 
Join Date: Jan 2006
Location: St Louis/LOTO
Posts: 733
Default

When merc put together their wiring harness, they did not know if the run from the key switch to starter would be 5 ft or 50 ft. Every time you double the length, you need to increase wire size. They also did not know what kind of key switch each boat manufacturer would use.
So to get around this, they just used an extra solenoid.
I wish they would have put as much thought into their other products, like bravos.
BTW, it's probably on the same bracket as the breaker.
rdoactive is offline  
Reply With Quote
Old 07-18-2007, 11:29 AM
  #7
Registered
 
ljsmith1's Avatar
 
Join Date: Aug 2003
Location: Stamford, CT
My Boats: 1987 Formula F223LS
Posts: 591
Default

On the same subject, I have a '87 Mag Alpha and I just replaced my slave solenoid about 2 weeks ago. It was the original, and it was toast inside. Anyway, I have only used the boat 3x since I replaced it. I replaced it with a Merc solenoid.

Now, it failed again! The ignition switch works but it doesn't energise the starter motor. I can hear the slave *click* *click* - but no turn over of starter. If I jump the terminals of the slave with my remote starter switch (handy tool!), the starter works fine and turns over the motor. I do not have a kill switch, nor are my shift interlocks a problem (it starts with the key 'on' when I jump the slave as described.)

BTW, I have a 3 season old ARCO starter.

Any Thoughts?

-Larry
ljsmith1 is offline  
Reply With Quote
Old 07-18-2007, 11:51 AM
  #8
Registered
 
Join Date: Jul 2007
Location: Austin,Texas
Posts: 2,111
Default

Early mercruiser with transmissions used a slave as part of neutral safety circuit. It would ground a little terminal to trannie linkage switch.
Jim
MOBILEMERCMAN is offline  
Reply With Quote
Old 07-18-2007, 02:09 PM
  #9
Registered
 
Join Date: Jan 2006
Location: St Louis/LOTO
Posts: 733
Default

Make sure the slave solenoid has a good ground.

Quote:
Originally Posted by ljsmith1 View Post
On the same subject, I have a '87 Mag Alpha and I just replaced my slave solenoid about 2 weeks ago. It was the original, and it was toast inside. Anyway, I have only used the boat 3x since I replaced it. I replaced it with a Merc solenoid.

Now, it failed again! The ignition switch works but it doesn't energise the starter motor. I can hear the slave *click* *click* - but no turn over of starter. If I jump the terminals of the slave with my remote starter switch (handy tool!), the starter works fine and turns over the motor. I do not have a kill switch, nor are my shift interlocks a problem (it starts with the key 'on' when I jump the slave as described.)

BTW, I have a 3 season old ARCO starter.

Any Thoughts?

-Larry
rdoactive is offline  
Reply With Quote
Old 06-17-2014, 06:52 PM
  #10
Gold Member
Gold Member
Gold Member
 
flashgordon's Avatar
 
Join Date: Sep 2012
Location: new baltimore mi
My Boats: 1989 scarab 38 excel-1986 scarabIII-1987 nova syder tw-330's-340/277/260 sea ray
Posts: 139
Default

hello,,you sound like u are having same problem. starter just clicks?? i even jumped the starter solenoid and starter worked. i thought it was a ign switch, swapped switchs, then someone in here mentioned the slave soleniod. a new one to me, so mine was right next to distributor, bolted to panel with a large push button fuse. good purchased a couple tomorrow. i will post if that solves problem.
good luck.
flashgordon is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
packinair
Swap Shop
10
07-16-2008 09:34 AM
jdub
General Q & A
6
04-13-2007 06:40 AM
Jerry B
General Q & A
5
06-14-2006 08:31 PM
seahawk
General Q & A
12
04-29-2004 02:21 AM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 06:45 AM.


Copyright 2011 OffShoreOnly. All rights reserved.