What Ohms Should Trailer Brake Magnets Be?
Updated 03/17/2025 | Published 04/02/2021
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Question:
When I have my brake controller connected and I apply my brakes, the trailer brakes grab regardless of the gain setting. I checked the ground and its good. I checked the resistance at each brake and one reads 2.0 ohms and the other reads 2.8 ohms. Single axle.
asked by: Patrick F
Expert Reply:
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 get 3.8-4.0 ohms, and for 10-12" brakes you should have 3.0-3.8 ohms.
If the brake shoes themselves are good you can replace just the magnet using 7" # AKBRKR-M7, 10" # AKBRKR-M10, or 12" # AKBRKR-M12.
If the shoes are needing replacement as well you will need to go with 7" braking assembly # AKEBRK-2, 10" # AKEBRK-35-SA, or 12" # AKEBRK-7-SA.
I included videos for the products mentioned for you to take a look at.
Jason Y.
1/15/2025
Hey Sam, My rear wheel drum on my Coromal Element tandem caravan is heating up after a short trip. The other 3 drums are fine. I have checked the ohms and they are all between 3.1-3.3. I have adjusted the shoes, checked the bearings. I am lost now?????? Do you have another suggestion as to what could be the problem mate Please
Kate F.
1/15/2025
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Mike
7/6/2024
I tested resistance at the 7 pin connector: between brake terminal and ground. I got 1.7ohms which I think means it would pull about 7 amps (between the 2 brakes) if I understand correctly. Sound right? Thanks.