Why is 40 Amp Circuit Breaker Used with 10 Gauge Wire for Universal Wiring Kit

Question

Question:

Hi etrailer, I was looking at your ETBC7 7-way harness kit. It listed #10ga wires. Is the Black wire in the black/blue bundle awg#10ga? It shows this is connected to the 40A fuse to the battery. The run from the battery to the 7-way connector is about 12 feet. From looking at wire current ratings everything says 40A should be #6awg wire. You guys are the experts and the kit is designed with 40A rating it just seems awg#10 is too small to carry 40A 12 feet. What am I missing?

asked by: Richard D

0

Expert Reply:

The 40 amp circuit breaker included with the Universal Installation Kit # ETBC7 is installed really close to the vehicle battery which is why it's rated for higher amps. True, by the time it reaches the back of the vehicle the amperage will be lower, but if we placed a lower circuit breaker up by the battery it would trip at times when we really don't want that happening.

Hopefully this helps clear things up for you! Let me know if you end up having any other questions.

expert reply by: Jon G

0

Answer 1

Hello Joe, Since your 2005 Ford F-150 already has the 4 flat wiring, you will need to build on top of that by installing the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires #ETBC7. To install the…

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Answer 2

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 3

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 4

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 5

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 6

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.…

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Answer 7

Hi Donny; after looking at several videos of the trailer it does appear to have a 6 on 5-1/2 bolt pattern with ST225/75R15 tires. The Goodyear Endurance ST225/75R15 Radial Tire w/ 15" Eagle Aluminum Wheel #GY97QB will be a direct fit.

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Answer 8

Unfortunately it will not Bill but congrats on the car! There's been two generation changes with big redesigns on the Corolla so the older hitch isn't going to be transferable. To add a hitch to your 2025 Toyota Corolla LE, I recommend the…

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Answer 9

Actually, the P3 now has the upgraded axis accelerometer like the P2. The Tekonsha P3 Trailer Brake Controller #90195, will work with both electric over hydraulic brakes on the trailer as well as electric brakes. It has a menu option on the display…

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Answer 10

Hey Jason, welcome back! The 15" x 6" Dexstar Steel Mini Mod Trailer Wheel item #AM20537 will work if you have 2" or more clearance between the side wall of your current tire and your trailer's frame. This wheel is only going to be…

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Answer 11

Hey Kyle, congrats on the new SUV! I am a big fan of the Redarc brake controllers for the exact same reason. The Universal Installation Kit for Trailer Brake Controller item #ETBC7 plugs directly into your 4-way connector and requires you to run a…

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Answer 12

Hey Greg thanks for all the information! To add a 7-Way connector and brake controller to your 2023 Ford F-150 XLT, I recommend the Universal Installation Kit for Trailer Brake Controller item #ETBC7, the No-Drill Bracket item #C57202, and the Redarc…

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Why is 40 Amp Circuit Breaker Used with 10 Gauge Wire for Universal Wiring Kit

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