What Fuse/Circuit Breaker is Needed For The Charge Line When Adding Curt Trailer Adapter #C57672?

Question

Question:

It wasn’t clear at first, but I figured out I have to run a 12 gauge wire from the black wire on this adapter up to the red battery terminal, and put a fuse in line with that. However, the documentation doesn’t say what type of fuse to use. I see 30 amp and 40 amp in different answers. Which is right, will both work, what’s the difference?

asked by: Josh L

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Expert Reply:

I recommend using the Wiring Kit # 5506 for running the wiring on your 2019 Mazda CX-5 with the Curt Trailer Connector Adapter # C57672. This kit includes duplex wiring for both the charge line and for adding a brake controller. The kit includes a 20-Amp # PK54220, 30-Amp # PK54230 and 40-Amp # 9510 circuit breaker. The 20-amp breaker is typically used to power the brake controller for single and tandem axle trailers. The 30-amp is typically used to power the brake controller when used when a trailer has 3 or 4 braking axles. The 40-amp is used for the charge line circuit. On a smaller vehicle like your CX-5 I recommend using the 20-amp for the brake controller and the 30-amp for the charge line since anything you tow will not have a lot of electronics and require the higher amperage from the vehicle battery.

expert reply by: Bud M

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Answer 1

For your 12V wiring to your 7-way, we have people running many different things off that 12V wire. 12 gauge or even better 10 gauge ensures that the power is transferred timely and accurately. We have a kit for brake controllers and 12V wiring for…

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Answer 2

Without knowing what the rating of the circuit breaker you have it would be hard for me to determine what would be the correct replacement just based on the picture you submitted. Your best option would be to find the installation instructions for…

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Answer 3

When it comes to installing The Redarc Tow-Pro Liberty #RED52VR if there is no trailer connected, the active calibration may occur as normal without any indication from the LED., provided your brake light trigger point is active when there is no…

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Answer 4

According to the troubleshooting section of the instructions the controller is telling you that the black power wire is not getting the 12 volts of power from the vehicle. This happens if the in line fuse or circuit breaker goes bad. Double check…

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Answer 5

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 6

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 7

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 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

Hi Jonathan, Sure thing, we can get your 2015 Toyota Highlander set up with a 7-way and brake controller so you can tow your camper. I'll go ahead and list out the parts you need for your Highlander without the factory tow package: - T-Connector…

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Answer 10

I recommend our etrailer Trailer Hitch Receiver #e75ZR as the best option for your 2024 Toyota Highlander. I feel this one is best as it has the easy bolt on installation with hidden cross-tube and a matte black finish for a clean OEM appearance. You…

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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

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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