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Adding in a switch circuit to a 389

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by welldigger00, Feb 9, 2022.

  1. Feb 9, 2022 #1
    welldigger00

    welldigger00 Light Load Member

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    I’m having a hard time finding any factory connectors that I can purchase so I can connect connect to a new spare switch with relay, and the relay board behind the A panel, right behind the steering wheel. My truck has only one spare switch, it’s already being used. My local Rush dealer is absolutely worthless helping me with this. My truck is pristine behind the dash, and all the wiring is unmolested, I don’t want to go the down and dirty route of scotch locks, spade terminals, and butt connectors. I am trying to add in a switch that I can operate an axle dump on my new step deck, so it will have some load, like 25 amps. I’ll bring in a heavier relay, so the load isn’t going through the switch on the dash. Any thoughts? Thanks fellas…
     
    welldigger00, Feb 9, 2022
    welldigger00, Feb 9, 2022
    #1
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  3. Feb 9, 2022 #2
    lester

    lester Midwest's #1 Feed Hauler

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    You really think just a dump valve will take nearly 25 amps?
     
    lester, Feb 9, 2022
    lester, Feb 9, 2022
    #2
  4. Feb 9, 2022 #3
    welldigger00

    welldigger00 Light Load Member

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    That is what Fontaine said it required. I’m not to sure on that.
     
    welldigger00, Feb 9, 2022
    welldigger00, Feb 9, 2022
    #3
  5. Feb 9, 2022 #4
    RocketScott

    RocketScott Medium Load Member

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    RocketScott, Feb 9, 2022
    RocketScott, Feb 9, 2022
    #4
  7. Feb 9, 2022 #5
    Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

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    Solder, heat shrink, non-insulated connectors.
    Rob a switch plug end off a wrecked truck or purchase new and just use the pigtails you need.
    Proper use of wire loom, zip ties (neatly trim the ends) and you can still have a pristine behind the dash.

    Wiring isn't difficult. I like to set my stuff up with a auxiliary fuse block and go from there, that way I have my wiring, and the factory wiring. Not robbing Peter to pay Paul with 12v.

    Wiring and electrical like you mentioned makes it difficult on the next guy, either who buys the truck after you, or the mechanic that comes in to fix the mess.

    Scotch lock's only place for me is a field fix to get me home so I can do the job right in the comfort of my own shop.

    Blue Sea Systems I think it is makes some quality fuse blocks. Del City is also a great supplier for components for doing a good clean electrical job.
     
    Caterpillar Cowboy, Feb 9, 2022
    Caterpillar Cowboy, Feb 9, 2022
    #5
    welldigger00 Thanks this.
  8. Feb 9, 2022 #6
    welldigger00

    welldigger00 Light Load Member

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    BD846253-7106-4DED-B4EC-4CB43826FE0D.jpeg Check this sexy thing out. I found it at a salvage yard, and it’s totally intact. Everything I need and then some…
     
    welldigger00, Feb 9, 2022
    welldigger00, Feb 9, 2022
    #6
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