How To Test a Breakaway System To Ensure it Will Activate the Trailer Brakes

Updated 07/17/2024 | Published 07/05/2024

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Digital Multimeter with 42" Long Test Leads - LED Display

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Question:

Is there a way to test the breakaway system on my trailer? I replaced the battery but still not working. The trailer was purchased new about 4 years ago so I thought it would be the battery. I was hoping that there is a way to check that the breakaway needs to be replaced before purchasing. Thanks

asked by: Tim

Expert Reply:

For a Breakaway Kit # 20400 the simplest way to test it is working is to simply pull the pin and verify power is getting to the brakes and preventing the trailer from rolling. You want to ensure your tow vehicle is disconnected electrically when doing this as I have heard of brake controllers being damaged by the power from the breakaway battery. If in your case the battery is dead you can use a Multimeter # PT89ZR to check for continuity on the breakaway switch when you pull the cable. If you do not have continuity when the breakaway pin is pulled you will need a new Switch # HM20010.

expert reply by: Bud M

Tim

7/17/2024

Hi Bud, Thanks for the explanation. I did a test and the brakes work with the cable pulled. But no lights show on the panel (push to test, etc). I’m not sure if it is charging the battery. Would it just be best to replace the breakaway kit or is there anything else to check or possibly repair? Thanks again for your help. Tim

Bud M.

7/17/2024

@Tim I would simply verify with a multimeter if your breakaway battery is getting charge from the tow vehicle while connected. While it could be the test panel is damaged the battery may not be getting a charge due to being hooked up incorrectly.

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