What is the best procedure for wiring to a fleetwood motorhome with a freightliner chassis,
asked by: Jim
The best procedure for installing the Tekonsha Prodigy P2 Brake Controller, part # 90885, on your Fleetwood Motorhome with a Freightliner chassis and air brakes is to follow the Brake Controller manufacturers instructions.
I contacted our representative at Freightliner, he informed me that if the motor home is a 2004 or newer there is a 6 pin connector under the dash that will be labeled either "TRBRK" or "TBC." This connector can be removed and the wires can be hard wired to the brake controller.
If the motor home is older than 2004 you will have to pickup the Brake Signal off of the Treadle Valve at the back of the Brake Pedal. The Treadle Valve is a valve that is operated by the Brake Pedal and directs air pressure from the dry reservoir tank to the brake chambers. The Treadle Valve also has a pressure switch that activates the brake lights on the rear of the vehicle.
If your motor home is older than 2004 I would recommend getting the brake controller installation kit # ETBC7, which includes the # 37185 adapter, as well as everything else you will need to complete the brake controller installation. You may need some extra wire depending on the length of the motor home, part #10-2-1.
To install the #37185 adapter, you would first plug it into your 4-Way connector, or splice into the vehicles brake, turn and tail light functions, and then connect the additional wires.
The additional wires would be installed as follows:
White: Ground, attached to a suitable location on the vehicle frame.
Black: 12v power lead wire, run to the vehicle positive battery terminal, with the 40amp circuit breaker included in the # ETBC7 kit.
Blue: Electric brake wire, connected to the blue electric brake wire coming from the brake controller in the vehicle cab.
Purple: This is an auxiliary wire, and can be used as a 12v power source, or to power a reverse light or reverse lockout function if needed. If not, this wire can be tied up.
If you do not already have a brake controller, I would recommend that you use the Prodigy P2 brake controller # 90885. This brake controller includes a pigtail that you will use to hard wire the unit to your vehicle.
The pigtail has four wires that will need to be connected as follows:
The 4 brake controller wire functions are:
White: Ground, attached to a clean piece of unpainted metal.
Black: 12v lead, attached to the vehicle positive battery terminal with either the 20amp or 30amp circuit breaker included in the # ETBC7 kit. Use the 20amp breaker if your trailer has 2 to 4 brakes, or the 30amp if the trailer has 4 to 8 brakes.
Blue: Electric brakes, attached to the blue electric brake wire from the # 37185 adapter.
Red: Stoplight switch, normally located directly off the vehicles brake pedal (in your case the treadle valve located behind the brake pedal)
To give you a closer look at how the adapter and brake controller are typically connected, I am including links to a set of videos demonstrating an installation.