Should Blue Wire on Trailer Have Power

Question

Question:

Should the blue wire in the main pigtail should I have juice

asked by: Freddie O

0

Expert Reply:

The blue wire on a trailer is typically the output wire to the electric brake assemblies. If this is the case on your trailer then the wire should only have power when you are hooked up to the tow vehicle and are applying the brakes, either by pushing on the brake pedal or by using the manual override lever on the brake controller.

Since trailer wiring colors aren't always consistent I do recommend verifying that this is the function of your blue wire. You can simply follow the wire along the trailer to see where it goes or simply test it by applying 12V power to see what function it activates.

expert reply by: Chris R

0

click to enlarge

Ron

4/23/2024

Should your blue wire that goes to the electric brakes on trailer ever go to ground? On a Lakota 2021 Charger LQ horse trailer..

Answer 1

Assuming that when you tested the resistance of the brakes you were testing the two wires on each magnet and getting 2.0 and 2.8 ohms the magnets on your trailer are not working correctly and will need to be replaced. For 7" brakes you should…

view full answer...

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…

view full answer...

Answer 3

We recommended to repack the wheel bearings on your trailer every 12 months or 12,000 miles. There is not a specific guideline as far as actually replacing the bearings. When repacking them with grease, you will also just want to check for any damage…

view full answer...

Answer 4

If you are having trouble with the brake controller not working, even after switching to the Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4 Axles - Proportional, part #90885, your brake controller could have an issue with not getting enough…

view full answer...

Answer 5

If your breakaway battery is dead, your brakes should operate while connected to your vehicle's 7-way trailer connector. If your brakes are not operating, then it sounds like you might have a short in the brake wiring of the trailer. Battery…

view full answer...

Answer 6

You're right, the mounting bracket is unique (in a good way) for the Curt TriFlex NEXT Trailer Brake Controller #C24VV. The bracket is smaller and all you do is put the included adhesive tape on the bracket and stick it wherever you like under…

view full answer...

Answer 7

To properly measure your broken leaf spring you will want to take a measurement from the center of the spring eye to the center pin on the leaf spring along the curve(measurement B in image). As this measurement will be the same no matter how worn…

view full answer...

Answer 8

In some cases trailer lighting will ground through the hitch ball but that's typically only if the actual ground circuit is insufficient. This is not an ideal setup. It needs to ground through the wiring of the trailer harness. You can test this…

view full answer...

Answer 9

A faulty trailer plug is a possibility. What you can do is check the plug to see if there is any type of corrosion built up that may be hampering it's functionality. If the corrosion is extensive and you are unable to clean it, you'll need to…

view full answer...

Answer 10

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

view full answer...

Answer 11

The typical function for the blue wire of trailer 7-way wiring is the brake output circuit which is what carries the voltage from the connector to the trailer brakes. We have this wire available as part #10-1-1 by the foot.

view full answer...

Answer 12

To verify that the 12V pin on your Sequoia's 7-Way connector is active, you can use a multimeter like #PT89ZR to test the voltage at the 12V pin (1 o'clock position) on the connector while the vehicle is running. You can also check the…

view full answer...

Should Blue Wire on Trailer Have Power

Product Page this Question was Asked From

Continue Researching