Installing a Brake Controller in a 2018 Winnebago Forza 34T

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Question:

I have a 2018 Winnebago Forza 34T which is already equiped with the 7 pin trailer plug. The coach has air brakes. Which wiring harnes would I need to install the Prodigy P3?

asked by: Charles A

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Expert Reply:

After checking numerous wiring diagrams for both the chassis and the body of the 2018 Winnebago Forza 34T I was able to determine that the coach was built on a Freightliner chassis. There isn't a plug-in type of brake controller for this chassis though so a brake controller will have to be partially hardwired in.

While searching for the brake controller wiring on the chassis I was unable to find anything labeled as such. Unless Winnebago techs know of where wiring for a brake controller is located the brake controller wires will need to be ran to the battery, brake switch, and 7-Way manually.

The brake controller white wire is the ground and needs to connect to the negative battery terminal. The black wire is 12-volt power in and will need to connect to the positive battery terminal via a 30-amp circuit breaker. Blue is output to the trailer brakes and will need to connect to the back of the 7-Way in the 7 o'clock position. And the red wire is input from the brake switch and connects to the cold side of the switch. You can use wiring kit # 5506 but you will likely need additional wire # 10-2-1, sold by the foot, because of the length of the coach.

A couple of things to consider: 1) to find the cold side of the brake switch use a circuit tester such as # PTW2993 to test the brake switch wires. You need the one that only has power when the brake pedal is pressed. If it has power at any other time, such as with the headlights or turn signals on, then it is not the correct wire. 2) if your coach has an exhaust brake that lights up the brake lights when active then it will likely apply the trailer brakes as well.

expert reply by: Michael H

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Answer 1

When testing the wire functions after installing the Curt TriFlex Trailer Brake Controller #C24VV and Wiring Harness #C51515 in your 2014 Toyota Sienna, it is normal for both the 12V and brake lights on a tester to light up without actually…

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Answer 2

If you are reading a constant 12 volts on the blue brake output wire with the Curt Venturer Brake Controller #C74VV installed, this is indeed an indication that either the controller itself is bad or there's a short somewhere along the brake…

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 5

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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Answer 8

The three most common lug stud sizes for a trailer are 1/2"-20, 9/16"-18, and 5/8"-18. In order to make sure you get the correct lug nuts you need to measure the lug studs on the trailer now as we have no way to look this up for…

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Answer 9

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 5 inch to 6 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Answer 10

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 11

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 12

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Installing a Brake Controller in a 2018 Winnebago Forza 34T

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