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Old 10-17-2014, 04:25 PM   #1
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No brakes?

my sons fw has no brakes when his Ford F-250 built in brake controller is slid to right. How do we check the somewhat corroded plug?thanks for you help...
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Old 10-17-2014, 06:05 PM   #2
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Which plug is corroded, the one on the truck or the one from the 5'er?
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Old 10-17-2014, 06:12 PM   #3
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CRC makes a spray cleaner for electrical contacts. If the corrosion is really bad, try a mixture of baking soda and water, then follow up with CRC Contact Cleaner. Then check out the plug.
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Old 10-17-2014, 06:25 PM   #4
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Stan yeah, the one on the 04 fiver....
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Old 10-17-2014, 06:55 PM   #5
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If you can figure out which wire is the brake wire, then get a sharp point and pierce the wire's rubber coating (when plugged into the truck) and check for voltage. Keep in mind that newer controllers use a pulsing voltage so digital voltmeters aren't fast enough to read the voltage. My GM is that way (not sure about the Fords)...you have to use an analog meter and then will see the needle pulse.
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Old 10-17-2014, 08:07 PM   #6
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Thanks will do that tomorrow...
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Old 10-17-2014, 10:01 PM   #7
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do yourself a favor, DO NOT Peirce the rubber. It is a sure way for that to corrode. Use a multimeter on the terminals themselves, then jump from the battery positive to the brake termals, you will hear a buzz noise in the wheels if there is power there.
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Old 10-18-2014, 08:46 AM   #8
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the factory controlers for the brakes will not work under a specific speed, I think 20 mph.
Also try the trailer with another truck and the truck with another trailer to eliminate the truck or trailer as the problem.
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Old 10-18-2014, 10:59 AM   #9
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Quote:
Originally Posted by harley View Post
the factory controlers for the brakes will not work under a specific speed, I think 20 mph.
Also try the trailer with another truck and the truck with another trailer to eliminate the truck or trailer as the problem.
Earlier Ford built in units would not work up to 5 mph, when the auto lock system hadn't activated. That was changed for the 2006 year and later so this should not be an issue for you.
Also, your blue wire is the designated color specific to your brakes.
Does you controller at the dash show green when applied? If it does, it sees a clear path to the brakes. If it shows red, it could very easily be your 7 pin connection.
Go back to your trailer brakes when the integrated controller is pushed and listen for a hum at the trailer brakes. If so, you have power back that far.
You also have a set of dedicated fuses under the hood for towing. Check these to be sure they're okay too.
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Old 10-18-2014, 11:29 AM   #10
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Until you take care of the "somewhat corroded condition" connecting it to another vehicle is useless. Clean the contacts first. Then troubleshoot. If not, you're wasting your time.
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