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suitable relay for glow plug circuit M 25

Discussion in 'Catalina 30' started by rmwac, Nov 29, 2014. Add this thread to a FAQ

  1. rmwac

    rmwac

    Joined Apr 22, 2011
    19 posts, 0 likes
    Catalina 30
    US Watkins Glen
    I have C 30 # 3619 with an M 25 diesel. I would like to use a relay to eliminate the glow plug power having to run to the cockpit panel, so I am working with heavier gauge wire, no trailer wire plugs. I have done the panel/wiring harness upgrade from Cat Direct. I am looking for a marine-suitable relay to use in this circuit. Thanks in advance.
     

    Attached Files:



  2. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    19,847 posts, 531 likes
    Catalina 34
    224 CA Maple Bay, BC, Canada
  3. centerline

    centerline

    Joined Mar 20, 2012
    3,983 posts, 186 likes
    Cal 34-III, MacGregor 25
    US Salem, Oregon
    A standard ford starter soleniod would work great... you can also get them in a 100amp constant duty model for a few more dollars... or the evviromentally sealed units.... but any auto parts store will have the ford starter relay/solenoid
     


  4. captnron

    captnron

    Joined Jan 6, 2010
    1,520 posts, 70 likes
    Catalina 30 Mark II
    US John's Pass Florida
    Guys,

    I need some Education here. Do I assume the relay is to save battery power not having the glo plugs energized when also cranking, thus saving draw?

    CR
     


  5. Maine Sail

    Maine Sail Moderator

    Joined Feb 6, 1998
    10,655 posts, 488 likes
    Canadian Sailcraft 36T
    US Casco Bay, ME

    No, the relay is simply to tap into the heavy gauge wiring so the small gauge run, that draws 45+/- amps, (in-rush is higher) does not need to carry the current all the way to the panel and then back to the glow plugs via small wire..

    I use a Cole-Hersee (often the 24059) heavy duty/constant duty solenoids for this as I find they last longer than the no-name intermittent duty versions from an auto parts store...

    Buy Cole-Hersee Solenoids At Sailboatowners.com
     


  6. mortyd

    mortyd

    Joined Dec 11, 2004
    937 posts, 12 likes
    Catalina 30
    US easy living
    pardon the ignorance of this hard-starting m25 owner, but what does the solenoid do and where does it go, both electrically and physically?
     


  7. captnron

    captnron

    Joined Jan 6, 2010
    1,520 posts, 70 likes
    Catalina 30 Mark II
    US John's Pass Florida
    Main,

    Thanks for clearing that up for me pal.

    CR
     


  8. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    19,847 posts, 531 likes
    Catalina 34
    224 CA Maple Bay, BC, Canada
    morty, you might want to read the link I provided, and the wiring diagram in the OP's post. They explain it pretty well.

    "Hard starting" rarely has anything to do with glow plugs (unless they're not getting warm, that is) and is usually related to poor electrical connections, whether the trailer plugs or the main engine ground connection.

    ***************************************

    Engines 101 - One of the better collections of M25 Series Universal Engine Information on the Internet, plus some M35, too :)

    http://www.c34.org/wiki/index.php?title=Diesel_Engine
     


  9. OS2Dude

    OS2Dude

    Joined May 7, 2011
    149 posts, 4 likes
    Catalina 30
    US Lake Lanier
    As Stu said below, Hard Starting has multiple potential causes. The PO of our 1985 with an M25 had the starter rebuilt, a solenoid (Starter Relay) for the starter, all kinds of 'fixes' done by a 'Professional Mechanic' that did not solve the issue. Once I replaced the OEM cable and plugs we've never had an issue since. Be sure to read this link for other things to be aware of: http://c34.org/bbs/index.php/topic,5078.0.html
     



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