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Old 07-28-2015, 09:17 PM   #1
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1976 31' Excella 500
Providence Village , Texas
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On the road help needed...

Ok, we are in the maiden voyage in our AS... I have a 76 31' with a P3 brake controller...

On the first drive the P3 recognized the trailer... However I noticed on the second part after about an hour the P3 was not recognizing the trailer and showed the no trailer connected.

All the the wiring is connected and I have power to the AS when hooked to the TV.

TV is a 09 Z71 Suburban-

I checked the 7 pin on the TV and I am pulling almost 14amps - checked the wiring at the brakes and nothing is disconnected.

There are no fuses blown (the that I have found) in either the TV or the AS....

What am I missing?
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Old 07-28-2015, 09:20 PM   #2
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Is the controller sending power to brakes?
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Old 07-28-2015, 09:39 PM   #3
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I have a P3. So you are saying that the no trailer connected message comes up? If so, then I would check continuity between the 7-way on the front of the trailer and the brake wires at the wheels. If you are getting voltage to the 7-way on your truck on the brake line and not at the brakes on the trailer, then something between the two is not connected. That said, if it was working I'd bet on either the connector on the truck or the trailer. I chased a bad connection on a rear turn signal for several trips. I finally took the 7-way on the truck apart and found that one pin (the small one inside the receptacle) was bent and also there was some corrosion. A simple fix. Best of luck.
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Old 07-28-2015, 09:40 PM   #4
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1976 31' Excella 500
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Quote:
Originally Posted by cwf View Post
Is the controller sending power to brakes?

They were- on the first leg- the P3 recognized the brakes- (the right one pulled a bit).

I am getting power through the 7 pin - but tomorrow I will verify the brake power lead on the 7 pin connector tomorrow. I believe this is the 5:00 pin looking into the connector...
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Old 07-29-2015, 02:35 PM   #5
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1978 31' Sovereign
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I have the same setup you do. It's awesome. Sounds like a bad connection. I use CRC electrical contact cleaner with a nylon brush. Hope it is an easy fix.
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Old 07-29-2015, 05:47 PM   #6
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Ok- cleaned all the contacts with electrical cleaner- and tested all the plugs and brakes, and a HUGE thanks to CWF down in Austin.. We think we have it narrowed down to the umbilical cord.... Currently checking continuity here... Will post up any other findings...
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Old 07-30-2015, 07:14 PM   #7
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Ok - thanks to all for the assistance... After cleaning and checking everything - it only left one item.... The brakes!!!

Yes it was the brakes.... The magnet had actually sheared off during the first leg- so needless to say I was lucky to find Liberty Trailer here in Little Rock- took one off and they matched it perfectly.... The bearings were still very well greased so easy off/easy on... 5 bolts two wires and everything is as it should be- a set of self-adjusting brakes for $86 - - took about an hour and a half and the controller reads the trailer.... I'm a happy camper...

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Old 07-30-2015, 07:20 PM   #8
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I am assuming all the other wheels were physically checked???
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Old 07-30-2015, 07:26 PM   #9
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Quote:
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I am assuming all the other wheels were physically checked???

Yes they were.....
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Old 07-30-2015, 07:58 PM   #10
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Sweet
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Old 07-30-2015, 08:22 PM   #11
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Safe and enjoyable travels to you
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Old 07-30-2015, 10:49 PM   #12
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Safe and enjoyable travels to you

Thanks - headed towards cooler weather....
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