Wiring Scheme for the Fuse Blocks under the helm of my 1987 300 Weekender

Discussion in 'Electrical Stuff' started by Doug W, May 28, 2017.

  1. Doug W

    Doug W New Member

    1
    Oct 27, 2013
    Sandusky, Ohio
    1987 300 Weekender
    Twin 350 Mercruisers
    Does anybody have what each fuse controls and can share any prints or schematics? I want to replace all the glass fuses and fuse holders with blade fuses and fuse blocks, but would like to know what each controls. I started trying the "easy" way by pulling fuses, but after having the 2nd holder break from being somewhat brittle I decided to stop.

    thanks in advance for anything you can share.
     
  2. Lee Hanson

    Lee Hanson New Member

    13
    Oct 20, 2017
    Aurora, CO
    1978 Weekender 300
    (2) Chev 350's direct drive via Velvet drive transmissions (Sure like those)
    I have a 78 recently acquired WE 30 and put out a call for wiring also. I just received an owners book from a great guy on this site which includes many schmedics(sp?) for a 300 Sundancer. Much of the wiring is very much the same and if you'd like I'll email you the same if you haven't gotten one by now.
    If you have received a better one I'd appreciate your sharing it with me.
     
    QT1 likes this.
  3. QT1

    QT1 Member

    322
    Oct 20, 2016
    Belair, MD
    1988 300 Weekender
    5.7 Mercruisers, Avon rib w/ Yamaha outboard
    Could you provide me a copy also? statenct@verizon.net
    thanks a bunch
     
  4. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Whatever schematic you get may no longer be accurate depending on what previous owners have done.
    If you have a few hours to kill one day and an assistant to give you a hand the best thing to do is what you started out doing. Just turn everything on and pull one fuse at a time to see what stops working then make your own fuse chart.
    Swap out the fuse block first so you don’t have problems with the retainers on the old one breaking. The clips are only riveted in and get pretty corroded and brittle over the years.
    I did that on my old 87 300 Sundancer and it worked out well.
     
  5. QT1

    QT1 Member

    322
    Oct 20, 2016
    Belair, MD
    1988 300 Weekender
    5.7 Mercruisers, Avon rib w/ Yamaha outboard
    That's a pretty tall order!
     
  6. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    You might be surprised. As JVM said, it's a pretty straight forward task. And I 100% agree that it's really best to start fresh. Who knows how many owners there have been to a 30-year old boat. Heck, I did this process at my HOUSE in under 2 hours as the panel wasn't labelled well. A 30 foot boat, with a fraction of the electrical of a bigger boat or a house, it's probably a one beer job.
     
  7. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Seems worse than it is. Longest part is swapping out the fuse blocks. Doing so will also give you the chance to clean up the connectors before you transfer them over.
    Just inspect and and clean them. If they look a little too funky you can just crimp on new ones.
    Between those old connections and the, probably by now, loose rivets on the clips that hold the glass fuses to your original 30year old fuse blocks your likely to have some phantom electrical issues anyway if you don’t address them now.
    The rest is really easy, especially with an assistant. Just turn absolutely every 12 volt item on and then pull one fuse at a time to see what stops working.
     
    QT1 likes this.
  8. QT1

    QT1 Member

    322
    Oct 20, 2016
    Belair, MD
    1988 300 Weekender
    5.7 Mercruisers, Avon rib w/ Yamaha outboard
    I may take on this project during the week, but I will have to tackle it alone. It sounds like it would be a great idea to change out the fuse blocks. Any suggested fuse blocks for this job? Thanks.
     
  9. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    There's any number of brands that can work, but you can't go wrong with a brand such as Blue Sea. I would get a block that has at least a few extra blanks/unused spots than your current number of circuits.
     
    QT1 likes this.
  10. QT1

    QT1 Member

    322
    Oct 20, 2016
    Belair, MD
    1988 300 Weekender
    5.7 Mercruisers, Avon rib w/ Yamaha outboard
    Thanks for the advice. Just went on the Walmart site and saw a sweet Blue Sea fuse block for $40.00! Love the upgrade with the blade fuses!
     

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