Where Does Blue Wire of 7-Way Usually Run When Installing on Vehicle

Question

Question:

If I was wiring a 7 pin trailer harness to my car myself, what do wire the blue to in my vehicle. Thanks

asked by: Mark S

0

Expert Reply:

The blue wire of a 7-way runs to the blue wire of a brake controller to activate the trailer's brakes. If you don't have a brake controller or a need for trailer brakes you'd simply not use that circuit. I attached a diagram that has the standard functions of a 7-way listed.

expert reply by: Jameson C

0

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Answer 1

It sounds like there might be some other fuses that could have blown, or there are some shorts on your brake controller/7-way circuits. It is hard to know exactly where the problem lies, but the first thing I would check would be to test the manual…

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Answer 2

Sounds like you have a Tekonsha Primus IQ brake controller part #TK90160. I attached a link to this page that has the owners manual/install instructions and then for a replacement wiring harness you'd want the part #20127.

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Answer 3

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 4

Hey Doug! This is a common issue with the Audi's and trailer's with LED's. The easiest way to address it is to use the 7-Way Trailer Adapter for Towing Trailers with LED Lights item #C57003. It simple plugs in-line with your Audi's…

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Answer 5

From what I could find on the Fastec 44610, it requires a cut-out of 5-1/4" tall x 2-3/4" wide. We do not have a lock option that matches up to that perfectly. The best option we have is the Bauer Products Rotary Latch #BA85FR which fits a…

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Answer 6

We do offer replacement jack options for the Kwikee Level Best 3000 Hydraulic Leveling System, part #LC359278 for 10,000 lb jacks or part #LC359275 for 17,000 lb jacks. These jacks will work on all four corners. If you don't know which weight…

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Answer 7

We don't offer an 8500 lb rated surge coupler, but we might have options that would work for you. If the GVWR (weight of trailer plug boat) is 8000 lbs or less, I'd recommend the Demco item #DM8669113 if your trailer has disc brakes or item…

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Answer 8

Yes, since the hub you currently have has 8-247 stamped on it the Trailer Hub part #8-247-50UC3-EZ that you referenced would be the correct hub for you to use. This hub is 10 by 2-1/4 inch and has a 5 on 4-1/2 inch bolt pattern.

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Answer 9

There a couple adapters which might work for you, the Hopkins #47435 6-Pole to 7-Pole or the RoadMaster #RM-146-7. I've left links to video reviews of both adapters for you to take a look at.

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Answer 10

The Hopkins 6 Pole to 7 Pole Adapter, #47435, does have a pin for the brake output for a brake controller. This adapter will work for your set up as long as the center pin of the 6-way plug on your RV is for 12v power and the pin in the 10 o clock…

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Answer 11

To see a couple diagrams that show how the 6-way to 7-way adapter part #47435 is wired up check out the pictures I attached. The 6-way of this adapter has the center pin as the 12 volt circuit. That is the usual circuit that gets moved around on…

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Where Does Blue Wire of 7-Way Usually Run When Installing on Vehicle

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