Trailer Brakes Apply when Emergency Flashers/Hazard Lights are On in an Older Ford Truck

Question

Question:

Using the P3 on an older Ford Truck and when the Flashers are on the brakes apply. Is there a way to be able to use the flashers and not have to disable the brake unit

asked by: Frank

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Expert Reply:

Yes, you need what is called a pulse preventer, # 5501.

You mentioned that you have an older Ford truck. Depending on how old it is you may need to connect the brake controller red wire to a different location on the truck. If your truck is a 1989 to 1991 model year you will need to locate the crescent-shaped turn signal harness located on the steering column under the dash. The connector will have two rows of wires (a row of 4 and a row of 7). Attach the brake controller red wire to the light green wire which is the second one in the row of seven.

expert reply by: Michael H

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Answer 1

That will depend on the amount of brake axles your trailer has. . The 20 amp breaker like #9506P is for 1 and 2 axle brakes, and the 30 amp like part #38630 is for 3 and 4 axle brakes

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Answer 2

To answer your first question, it is possible to splice the brake controller's 12 volt power wire into the 12 volt power wire you have attached to the vehicle's battery to charge the trailer's battery but this is certainly not recommend.…

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Answer 3

If your trailer has 7 wires running all the way back to the brakes, then yes, you can tap into the existing wiring. Each of your new brakes will have two wires for the brake magnet. One wire is for 12 volt power to the brake magnets and the other…

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Answer 4

Typically trailer wiring is color coded. The brake circuit is usually a blue wire which travels to each brake magnet, where it is attached to one wire from each brake magnet. The other wire from each brake magnet will ground to the trailer frame. I…

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Answer 5

If the red wire from your brake controller is tapped into a wire that has voltage when the hazard lights are activated then this situation will occur. You will need to attach the red wire from the brake controller to a brake signal wire, under the…

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Answer 6

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 7

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 8

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 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

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 11

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 12

You can add larger wheels and tires to a trailer as long as you have enough room for the larger size. The main clearance issues we find when putting larger tires and wheels on a trailer is from the top of the tire to the fender and from the inside…

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