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    The Switch-Pros 9100 changes the game when it comes to adding lights and other aftermarket accessories to a vehicle. But if care is not taken the wires will quickly tangle and become difficult to manage. by providing your aftermarket accessories with a convenient and reliable place to connect, you reduce the chances of something going wrong. and if an electrical gremlin does start causing issues, trouble shooting is much easier when everything is layout out and displayed in an orderly fashion.

    Now, you'll want to do as much prep work as possible before installing the Switch-Pros PowerTray system in your vehicle.


    1) Begin by prewiring the Switch-Pros output leads to the Positive Terminal Block.
    • Mount the Switch-Pro and Blue Sea components to the PowerTray using the provided Accessory Hardware.
      • The Busbar will use the shorter 3/8" length machine screws; Everything else uses the longer 9/16" length machine screws)

    • Route the Switch-Pros wires down under the unit and up though the space between the terminal block and Switch-Pros. Temporarily hold the wires in place by removing the Terminal Block’s screws and reinserting them with the wire under the screw head.

    • Once all 12 wires are routed and secured under the screw heads, adjust them for aesthetic/uniformed length. Begin cutting them one by one using the edge of the Positive Terminal Block as a guide. This will ensure they are all uniform in length. (Note: If your wire cutters are too bulky to get in there, use a pen or marker to mark a cutline on the wires so they can be removed and cut)

    • Once all the wires are cut, flip the PowerTray over and begin stripping the ends in order to crimp on the heatshrink ring terminals. Lastly, apply heat to the terminals to fully seal and protect the connections from water and corrosion. 


    • Pro Tip: After the ring terminals are crimped and sealed, remove the Switch-Pros base module from the tray before attaching the wires to the terminal block. This will give the ring terminals more room while screwing them to the Terminal Block. Once the ring terminals are secured to the terminal block, move the SP's base back into location while using the back of the SP to uniformly push all the ring terminals down at the same time. The insulation will be pressing against the back of the base module. So slightly wedge your finger between the the two to add some distance between them so they don't rub.

    • Lastly, attach the Negative Stubby Cable taking special care to its orientation as the cable is made with reversed lugs to account for the height differences between the fuse block and busbar.

    2) Run the SP harness though the firewall

    • Unfortunately I don't have any pics of this process at the moment. But you'll want to do this before you do the actual install so you aren't so cramped.
    • One strategy that we use, is to poke a zip tie though the main wiring harness boot on the drivers side firewall. Poke the zip tie through from inside the cab (so the connector can be pulled from the engine compartment, back into the cab). Then tape the connector to the zip tie.
      • Pro Tip: Electrical tape works best because it's stretchy and smooth. When taping the connector to the zip tie, start a little higher up on the zip tie and wrap towards the connector. This does two things; First it provides layers to act as the slope so the tape doesn't get hung up when going through the rubber boot; Secondly, starting up higher on the zip tie provides more surface area for the tape to adhere to. Also use some type of lube around the outside of the tape to help it squeeze though the factory wire harness boot on the firewall.

    The pre-wiring stage is complete. Next step is to install the PowerTray in your vehicle.

    Installation for Tacoma's CLICK HERE

    Installation for 4Runner/ FJ Cruiser/ GX CLICK HERE