- 1). Park the truck on a flat and level surface and set the parking brake for safety's sake. The trailer should already be attached to the rear hitch. Pop open the truck's hood, prop it open and locate the negative lead on the truck's battery, which generally features a black colored wiring cover. Disconnect the negative lead with a flathead screwdriver.
- 2). Screw a 20-amp circuit breaker directly into the metal radiator support arm; there should be small holes in the arm that allow you do this, so there's no need to drill new holes into your truck. Secure the breaker in place with nuts threaded onto the underside of each screw.
- 3). Connect either the right or left side of the breaker---which depends on how you positioned the breaker---to the positive (red) terminal located on either the top or topside of the battery in the truck by using a connector ring that secures the wire between the ring and the terminal itself.
- 4). Open the door of the cab to determine the best location of the brake controller in the cab's floorboard. Controller placement is a matter of preference, but you'll want it to be placed where it can be pressed on easily without getting in the way of other floor pedals.
- 5). Attach one end of a length of 10 or 12 gauge wiring to the other exposed terminal on the breaker; connect the other end to the controller's black wire via a butt connector. Solder-less connectors are recommended to negate the use of using high heat on the controller's delicate wiring. Use another length of wire from the controller's white wire to the battery's negative lead. Connect them with another connector. Reconnect the battery leads back into place.
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