Intermittent Brake connection

[pinstriper]

[quote timestamp="1431969603" author="@mitch" source="/post/11029/thread"][quote source="/post/11022/thread" timestamp="1431960207" author="@pinstriper"][p]How do you know you lost connection to the controller ? What were the actual symptoms that lead you to this ?[/p][p]
[/p][p]Also, what controller ?
[/p][/quote]I use a Prodigy P2 controller, I know when it's connected because the display will show a C, when it's not it shows a period.  So I started out with a normal C display, sometime during the trip I glanced at the controller and the C was gone, only a period.  Once in a safe spot I tried to use the manual brake lever on the controller to see what that would do and the display read NC for Not Connected.  [/quote][p]Ah, that's helpful, thanks. The same happened with our P3 which is wireless, as the controller was getting interference from a cell phone that was sitting in contact with the handheld.[/p][p]
[/p][p]There are testers that you can put on the plug to test the wiring in one shot. I'd be looking at wiring.[/p][p]
[/p][p]From the Tekonsha website for the P2 showing NC or not C:[/p][p]

The P2 has to have a complete circuit on the Blue wire to the trailer brakes and then to ground. Possible causes: •Open on brake circuit (Blue wire).
•Power back feed on brake wire (Blue wire).
•Trailer has electric over hydraulic brakes and control set for electric brakes.
•Brake circuit has incorrect resistance on electric brakes.
•Open on ground of brake circuit.

[/p]

[mitch]

[quote source="/post/11075/thread" timestamp="1432045902" author="@pinstriper"][quote source="/post/11029/thread" timestamp="1431969603" author="@mitch"]I use a Prodigy P2 controller, I know when it's connected because the display will show a C, when it's not it shows a period.  So I started out with a normal C display, sometime during the trip I glanced at the controller and the C was gone, only a period.  Once in a safe spot I tried to use the manual brake lever on the controller to see what that would do and the display read NC for Not Connected.  [/quote][p]Ah, that's helpful, thanks. The same happened with our P3 which is wireless, as the controller was getting interference from a cell phone that was sitting in contact with the handheld.[/p][p]
[/p][p]There are testers that you can put on the plug to test the wiring in one shot. I'd be looking at wiring.[/p][p]
[/p][p]From the Tekonsha website for the P2 showing NC or not C:[/p][p]
[/p]

The P2 has to have a complete circuit on the Blue wire to the trailer brakes and then to ground. Possible causes: •Open on brake circuit (Blue wire).
•Power back feed on brake wire (Blue wire).
•Trailer has electric over hydraulic brakes and control set for electric brakes.
•Brake circuit has incorrect resistance on electric brakes.
•Open on ground of brake circuit.

[p][/p][/quote]I think it's a simple case of loose connection between the blue wire spade in trailer plug and the tow vehicle receptacle.  I've taken it all apart and everything looks good from a wiring standpoint.  Of course it's always possible the blue wire is failing somewhere else in the circuit but since I regain the connection when I jiggle the plug that scenario seems highly unlikely.  I've cleaned everything up and snugged up the gaps in the trailer plug, we'll see what happens, thanks for looking that stuff up.