Brake controller help
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Senior User
Joined: Nov 2004
Posts: 196
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From: Texas
Brake controller help
My brake controller doesn't always show connection and then sometimes does. However I don't power to the brakes either time. This just started after putting on new brakes. Vehicle F350, 2004, Don't know where to start looking.
Thread Starter
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Senior User
Joined: Nov 2004
Posts: 196
Likes: 1
From: Texas
Yes they engage, but when the 7 pin is plugged in and breakaway pin is in there is no power to brakes.
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
Since you know the trailer brakes work, you can forget everything on the trailer from the junction box back. I would suggest focusing on the seven pin connection between your truck and the trailer. Do all the trailer light work when plugged into the truck?
FTE Remembers
Joined: Jul 2005
Posts: 65,938
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From: Millersville, MD
Steve, why I asked about 5er or tag along is what is he using for a ground? If a tag-along, is he using a dedicated ground or depending on the hitch ball to connect the trailer ground to the truck..... a hitch ball ground can surely cause a on again-off again connection.
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Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
On your seven pin on your truck working the controller manually, what kind of voltage are you getting between the pin for the brakes and the ground pin?
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
I agree.i just haven't seen anything without s dedicated grounding pin for years. I know it is a code violation to manufacture without one, so hopefully they are few and far between.
Post Fiend
Joined: Jun 2014
Posts: 6,801
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From: DFW, TX-GoldCanyon, AZ
Most truck-side trailer wiring recepticals have their ground wire connected via a crimp on connector screwed to the chassis.. More than half of all automotive eletrical problems are related to ground issues...
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
Easy to determine bad ground. Brake pin and ground pin voltage and if low, brake pin and chassis voltage.
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
Now since you know you have power, your next focus would be the seven pin connection between your truck and trailer. With the seven pin connected, have someone work the controller manually and take a voltage reading on the blue lead at the junction box on the trailer. The voltage there should be the same as it was at your truck.
Steve