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Old 03-10-2019, 08:52 PM   #1
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Brake controller issues

Our tow vehicle needed a new battery this winter.
When DH replaced it the brake controller gave an error code which we knew was that a trailer was not attached. LOL! We knew that. It has been in storage since November.

Today our tow vehicle brake lights were flashing similar to hazardous lights. The brake controller was clicking.
We didn't want to run down a brand new battery so we disconnected.

Anyone experience this?
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Old 03-10-2019, 09:20 PM   #2
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If it’s a Ram, check the brake light switch. Common failure but easy to replace. Will flash CF on the factory brake control and give the trailer disconnected message. Cruise control will also not work. Sometimes you can pull the plunger on the switch out - it kind of ratchets and locks in a longer extended position. If that works, change the switch anyway as it will fail again.
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Old 03-10-2019, 09:25 PM   #3
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It would help if you posted year, make and model of vehicle, since you didn't list it in your profile.
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Old 03-11-2019, 06:53 AM   #4
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Brake Controller

You are correct, I should have.
2004 Chevy Trailblazer.

This only happened after DH disconnected and replaced the old battery.
The OC error code came on , but turned off.

We walked into the garage yesterday and the brake lights were flashing and the brake controller as well and was clicking. Never had it happen before.

Planning to make sure the 7 PIN receptacle on the Blazer doesn't have dirt/debris.

Thank you.
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