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"Standard" Wire colors to the controller:
Black, Battery Positive to controller
White, Negative Ground for Controller
Blue, Brake feed from controller to Trailer plug at back of truck
Red, tap into truck Brake light switch signal to tell controller
to apply brakes
Remember, the above colors are just a GUIDE. your colors may
be different, read the instructions! I have seen many factory
harnesses that have a extra wire for dash lights (usually
brown). Most controllers do not have "dash lights" so don't
hook that wire up.
Below is a example in a Titan, other may be similair:
Installing a brake control unit isn't very difficult. This task is made even easier if your tow vehicle is a late model and comes with a 7 Way Connector as part of the towing package. Nissan Titans with the "Big Tow" Package will have the wire connectors in place.
In this case, installation is as simple as mounting the brake
controller in a convenient, easy to reach place, usually under the
dash, just above your right leg and connecting the wires from the
brake control to the wiring harness and then plugging the harness
into the harness located under the dash.
On Nissan Titan trucks, with the tow package, the factory provided a plug under the dash to connect the brake controller. On the trucks I have done, it is a plug, located up in the dash, just above park brake, up under the dash. You must have the factory plug harness to plug in (I sell these, if you need one, hint, hint)
The connector is taped to a wire harness to the left of the
steering column. The easy way to get to it is to remove the
plastic trim below the steering column. There are two phillip head
screws at the bottom. Remove those and the panel will then snap
off. You can then get to the connector.
Then it is just a matter of connecting the harness up to your brake controller, according to the wires functions using butt connectors, and then plug it in. Mount the controller where your want it. I prefer to have it on the right side of the steering wheel, within reach of my right hand. Just screw the bracket right into the plastic dash panel (I know, it hurts!) I do stock factory custom made harnesses that will plug the Prodigy Brake Controller directly into the Nissan:
You MAY need to install the relays for your trailer brakes. You
will have to look in you owners manual to find the size and
location, and any relay you may need to install. Sorry, they are
all different.