Amperage of Brake Magnets and Size of Wire Used To Connect 7-Way Trailer Plug To Electric Brakes

Question

Question:

How much much amperage does each electric brake magnet require? I am trying to figure out what size wire to run from the trailer plug to the electric brakes. Thanks

asked by: Tom H

0

Expert Reply:

On each individual electric brake magnet the amperage draw would be 3.0 to 3.2 max amps at 12 to 13 volts on 7-inch brake magnets and 3.2 to 4.0 max amps at 12 to 13 volts on 10 and 12-inch brake magnets.

The max amperage draw for the brake magnets on a single axle trailer (2 brakes) would be 6.3 to 6.8 max amps on a 7-inch brake system and 7.5 to 8.2 max amps on 10 and 12-inch brake system. The amps will be higher if using a tandem axle or triple axle trailer.

I am including a link to a FAQ page on Electric Trailer Brake Magnets that will show you how to test them and list the numbers I mentioned above.

On a 7-Way connector the suggested minimum wire gauge for the White (ground) wire, the Red or Black (power) wire, and the Blue (brake power) wire is 12 gauge. The minimum wire gauge for the remaining Green (right turn/brake) wire, the Yellow (left turn/brake) wire, the Brown (tail lights) wire, and the Purple (reverse light) wire is 16 gauge.

expert reply by: Jeff D

0

Jody P.

7/10/2020

I just put a brake controller on my Mercedes suv and curious how much current the controls require. Do I need an amplifier/booster or will this drive a two axel brake system?

Reply

Chris R.

7/14/2020

You shouldn't need any kind of amplifier for the brake controller - the controller itself should be getting power directly from the vehicle's battery. Are you having any issues with it?

Reply

Akshay S.

12/4/2020

@ChrisR Hi, We are developing a semitrailer where brake controller is installed on trailer and getting power from drive unit battery.when detached we need to track trailer so we also place one auxiliary battery in trailer so, that it can power when detached. Can u please suggest how much current will be taken by controller for 12V. Supply. Thank you,

Reply

Jon G.

12/4/2020

@AkshayS What size brakes are you dealing with on your semi-trailer? It's my understanding that semi-trailers use air brakes so you'll need to make sure you have some kind of conversion if this is the case. Jeff D addresses 10" and 12" brake assemblies above so if you have something else then that power draw can be different. Just to give you a reference point, the Hopkins Engager Breakaway Battery Kit # 20400 is used for up to 2 axle trailers with electric brakes.

Reply

Answer 1

Typically a tandem trailer brake setup will be rated for up to 20 amps of 12 volt power. So basically each axle of brakes is rated for 10 amps.

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Answer 2

Hey Mark, since we know your trailer has two 7k axles and a bolt pattern of 8 on 6-1/2 inch the correct DeeMax disc brake kit would be the part #DE66AR which comes with everything needed to add electric over hydraulic DeeMax brakes to your trailer.

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Answer 3

Maximum amperage draw for 4 Brakes that are 10 or 12 inch diameter is 15.0 to 16.3 amps at 12 to 13 volts. The 14 gauge wire may be sufficient but for maximum braking effectiveness at full load capacity. I would opt to run 10 gauge wire. Larger wire…

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Answer 4

Hey Todd. I wasn't able to get anything off of the 2024015099 number you gave me. The 2nd generation replacement front jacks that fit the first generation Level Up systems are listed below: Lead Leg - Replacement Hydraulic Jack Assembly for…

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Answer 5

I have included a link to a video on adjusting self-adjusting brakes. Basically there is a device on the adjustment wheel on these brakes that prevents the shoes from adjusting back inward. You have to sort of move that out of the way to be able to…

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Answer 6

Self-adjusting brakes #AKEBRK-7-SA do not require that you travel in reverse for them to adjust. They can adjust themselves going forward or backward. Keep in mind that even self-adjusting brakes require 1 initial adjustment. You could just install…

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Answer 7

After installing replacement brakes such as the Dexter Nev-R-Adjust Electric Trailer Brake Kit, #23-468-469, proper adjustment is needed for that initial setting. If your brakes are engaging but not enough to apply ample friction for stopping then…

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Answer 8

Hey Chris, I appreciate you getting me the axle tag from your trailer as it is helpful to know you have a Lippert 7k axle but that axle can have either a 1/2 inch, 5/8 inch, or 9/16 inch diameter wheel stud so I would need to get any info you can…

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Answer 9

Hello Jim, Thank you for all the information, it is most helpful. We have something that will work as a direct replacement, but the Advent Air Low Profile RV Air Conditioner - 13,500 Btu - White #ADV79FR will require a new set-up as it is not…

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Answer 10

Sway control is designed to be used in situations where the trailer sways under adverse conditions such as high winds or when large vehicles are passing causing the trailer to become unstable. Sway control also helps if you have to maneuver suddenly.…

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Answer 11

The attachment bolts for a 5-bolt brake assembly like the part #AKEBRK-6R should be torqued to 30-50 foot/lbs. If you don't have a torque wrench handy, if you tighten the bolts until the lock washers flatten out, you'll be pretty darn close…

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Answer 12

Hi Kevin; the answer to your question is yes. The DeeMaxx Disc Brake Kit w/ Actuator #DE66AR will work with your 2024 Ram factory brake controller.

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Amperage of Brake Magnets and Size of Wire Used To Connect 7-Way Trailer Plug To Electric Brakes

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