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Thread: Wiring diagram : Trailer Isolation Relay on ST 1300

  1. #1
    userzero's Avatar
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    Wiring diagram : Trailer Isolation Relay on ST 1300

    A member on this forum asked if I could provide him with some information on how to connect a Electrical Connection Trailer Isolation Relay on a ST1300.

    I decided to draw a little wiring diagram with the correct color codes to make it easier.

    For those who are not familiar with isolation relays, they act as a barrier between the motorcycle's wiring system and the trailer wiring. So anything can happen to the trailer, like short circuits, and it will not affect the motorcycle systems in any way. Some have them, many think they are not necessary. In any case, I sleep better knowing my trailer install cannot hurt the motorcycle's electronical systems.








    If anybody spots a mistake in the diagram or want to improve upon it, please let me know and I'll be happy to add your input.


    › See More: Wiring diagram : Trailer Isolation Relay on ST 1300
    Last edited by userzero; 07-11-2010 at 08:16 AM. Reason: Added some info on the drawing as suggested in post #2
    Armoric Designs monowheel trailer + EC trailer isolation relay
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  2. #2
    Bob rjs987's Avatar
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Good diagram. Would even be able to translate for the ST1100.
    Just might be helpful to point out which factory wire is tail light and which is brake light (green-yellow or black-brown). Those with a service manual should have no problem finding that info. Shouldn't make any difference if the colors are connected as shown but might help if needing to troubleshoot a problem after connecting it all up. When I decide to add this to my ST1100 I'll have to take pictures and post a translated diagram for that. I added an isolation trailer module to my Gold Wing many years ago. Have been thinking about pulling a trailer again, but not a pop-up camper like I had before.
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  3. #3
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Good point! I modified my drawing accordingly. Thanks!

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    roadriderg's Avatar
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Good work, Just curious where did you mount your isolator?

    Gary
    Gary

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  5. #5
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Quote Originally Posted by roadriderg View Post
    Good work, Just curious where did you mount your isolator?

    Gary
    It's under the back seat, wedged in a recess right by the tail light assembly, under the tool kit. It's not mounted or bolted or anything, it's just wedged under there.

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    Bob rjs987's Avatar
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Attached here is the wire diagram that I use when I build my own wire harness for a trailer using standard automotive relays (3) for a 5 wire trailer hook up. I only actually tap the bike turn and brake light wires to trigger the relays and do not touch the bike running light wires. Power on my bike comes from a fused isolation power panel I added that is only powered when the bike is turned on. This is an alternative to the wire harness from EC or any other vendor if you are handy doing your own wire work. You decide if you crimp or solder your wire connections. I prefer to solder mine.

    Correction: I used to solder all my connections but in my old age I am getting lazy. I have lately been crimping the spade connectors for the relays and lathering the wire in dielectric grease. The crimp spade connectors are good ones and hold well. If I find a problem with any of these I will go back and solder them. But so far they have held up well. I still solder any other connections I make including splices and the connector pins and cover with heat shrink insulation. I WILL NOT USE those cheap SCOTCH (blue) crimp splice connectors as those are prone to poor connections and corroding over time and ending up causing many more problems. Those connectors are only acceptable for very temporary emergency situations where no other option is available.

    Last edited by rjs987; 03-23-2011 at 06:09 PM. Reason: corrected fuse ratings

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    Mark Kunath/ST 1800 Bigmak96's Avatar
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    I actually think I can handle this one The past has not been a real confidence builder.
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    2 Wheels and a Photographer rackovanz's Avatar
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    What is EC? Where did you get the harness?
    2006 ST1300 STOC#8267

  9. #9
    2 Wheels and a Photographer rackovanz's Avatar
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Nevermind I found it.

  10. #10
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    Re: Wiring diagram : Trailer Isolation Relay on ST 1300

    Quote Originally Posted by rjs987 View Post
    Attached here is the wire diagram that I use when I build my own wire harness for a trailer using standard automotive relays
    That's a great addition to this thread! Thanks!

    Quote Originally Posted by rjs987 View Post
    You decide if you crimp or solder your wire connections. I prefer to solder mine.
    Same here! Soldering eliminates so many problems down the road.

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