What is the Maximum Amperage Draw of Trailer Brake Magnets on a Tandem Trailer with Four Brake Drums

Question

Question:

What is the full load amperage that four drum magnets draw? I have four magnets on four drums. I dont know the drum size just now, but they are on a 25 foot goose-neck horse trailer. Right now they are fed with 2 conductor 14 gauge wire from the factory. Is this right , or should I change it out to 10 gauge? Thanks

asked by: Ed S

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Expert Reply:

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 will only help the effectiveness of the trailer brake system and 10 gauge is what we use when installing trailer brakes even on single brake axles with 7 inch brake assemblies.

We offer Jacketed 2 Wire, 10 Gauge, Brake Wire, item # 10-2-1, by the foot, for replacing the brake wiring on your trailer. When ordering just enter the number of feet needed in the quantity box.

I have linked a trailer brake installation and wiring video for your to review.

expert reply by: Robert G

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Answer 1

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…

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Answer 2

Since your hub/drum is 12 inch by 2 inch the correct self adjusting brake assemblies would actually be the part #AKEBRK-7-SA. Then for the correct hub/drum you'd want the part #AKHD-655-6-EZ-K. The drum portion of a hub doesn't affect the…

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Answer 3

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…

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Answer 4

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 5

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 6

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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Answer 7

The reverse light circuit on most vehicles usually have a max amperage draw of around 5 amps. The amperage is usually limited by the gauge of the wire used on the circuit. The recommended wire size for the reverse light pin on the Pollak Black…

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Answer 8

Yes, 14 gauge wire seems too small. I would go with 10 or 12 gauge. For 10 gauge you can use #10-1-1 and for 12 gauge use #12-1-1. These wires are sold in increments of 1 foot. So if you needed 20 feet of wire you would enter 20 in the quantity box.…

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Answer 9

My online research did not turn up any direct replacement parts for the HB732 hub you referenced. However, we can help you select new replacement hubs. The things you need to know in order to select replacement hubs are: the bolt pattern on your…

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Answer 10

The Dexter 8-133 axle according to my contact at Dexter is an old motorhome axle they no longer make. Their tech said the motorhome axles like what you have are designed for one time use so there are not compatible parts made for even replacement…

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Answer 11

You will need to get the other bearing number from inside your current hubs before we can pick you out replacement hubs. Most likely the outer bearing you pulled is a LM67048 and the inner you have is a 25580 which would mean that the #8-201-5UC3…

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Answer 12

The only difference between the 010-036-00, our part #GS-2250DL, and the 010-054-00, our part #RG06-070, is that the 10-036 comes as a single unit while the 10-054 comes with 2 seals. Other than this they both have the same ID of 2.250" and OD…

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What is the Maximum Amperage Draw of Trailer Brake Magnets on a Tandem Trailer with Four Brake Drums

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