I recently purchased a Prodigy P3 brake controller. After installing it, I have run into an issue about the brakes engaging on the TT.I have set the P3 to 7.5 and the boost to 2 and the type to Electric. When I step on the brake, the TT brakes barely engage.Manually applying the trailer brakes causes the TT brakes to engage, but the do little to stop the truck an trailer. I had the TT brakes adjusted by a pro at the local RV dealer. Under the old Tekonsha Envoy controller, I could apply the TT brakes manually and lock them up.I am looking for solutions to this problem so I can get the P3 adjusted properly. I am going to spray WD40 into the TT plug to get rid of any corrosion that may be present and cause the signal from the P3 to work properly.Any other ideas would be greatly appreciated.

Dial in more power. To just before lockup with the manual handel. Also. I wouldn't use WD40. I use electronic contact cleaner.

With the help of another person have 1 person operate the brake controller manual operator and the other measure the voltage at the bumper plug/connector on pin 4. Be sure to turn the controller to max output. Only way to be sure - you should read 12 VDC.With the Boost set on 2 (30% I believe) and turning on the controller with the manual operator (minimum) you should read 3.6 Volts for 2 seconds - then it will turn off.

I ran my prodigy on 12 and boost 1. What I'm saying is that each trailer and truck combo is different. That's why they are adjustable.

I have set the P3 to 7.5 and the boost to 2 and the type to Electric. When I step on the brake, the TT brakes barely engage. Manually applying the trailer brakes causes the TT brakes to engage, but the do little to stop the truck an trailer. I had the TT brakes adjusted by a pro at the local RV dealer. Under the old Tekonsha Envoy controller, I could apply the TT brakes manually and lock them up. I had (sort of) the same issue with the same controller. I also found that the P3 is not a 'set it and forget it' controller. Mine will lock up the wheels at in town speeds and seem to have little braking at highway speeds if not adjusted for conditons. As a start go higher on the voltage and boost and then back it down to where you are comfortable. After I began to understand the controller I now have the brakes where I want them both in town and on the highway but it does require a re-adjust on the boost. If you don't think the controller is working properly tow a different trailer and see how that works.

jmtandem wrote:I had (sort of) the same issue with the same controller. I also found that the P3 is not a 'set it and forget it' controller. Mine will lock up the wheels at in town speeds and seem to have little braking at highway speeds if not adjusted for conditons. As a start go higher on the voltage and boost and then back it down to where you are comfortable. After I began to understand the controller I now have the brakes where I want them both in town and on the highway but it does require a re-adjust on the boost. If you don't think the controller is working properly tow a different trailer and see how that works.I have same issue as jmtandem, just use boost 1 for city traffic light and boost 3 on highway. My rig is a 1996 C1500 towing a 6,300 TT. I had to adjust the TT brakes annually and change the voltage for the brakes as said above. I used the TT in hilly terrain and as the brakes wore on the effectiveness wore on I ended up selecting a higher voltage setting, may not be the best way when the best way is adjusting the brakes.

Prodigy P3 Issues | Good Sam Community

14 Replies

jmtandem
Explorer II
Oct 17, 2013
I have set the P3 to 7.5 and the boost to 2 and the type to Electric. When I step on the brake, the TT brakes barely engage.
Manually applying the trailer brakes causes the TT brakes to engage, but the do little to stop the truck an trailer. I had the TT brakes adjusted by a pro at the local RV dealer. Under the old Tekonsha Envoy controller, I could apply the TT brakes manually and lock them up.

I had (sort of) the same issue with the same controller. I also found that the P3 is not a 'set it and forget it' controller. Mine will lock up the wheels at in town speeds and seem to have little braking at highway speeds if not adjusted for conditons. As a start go higher on the voltage and boost and then back it down to where you are comfortable. After I began to understand the controller I now have the brakes where I want them both in town and on the highway but it does require a re-adjust on the boost. If you don't think the controller is working properly tow a different trailer and see how that works.
raygreg
Explorer
Oct 17, 2013
I ran my prodigy on 12 and boost 1. What I'm saying is that each trailer and truck combo is different. That's why they are adjustable.
wittmeba
Explorer
Oct 17, 2013
With the help of another person have 1 person operate the brake controller manual operator and the other measure the voltage at the bumper plug/connector on pin 4. Be sure to turn the controller to max output. Only way to be sure - you should read 12 VDC.

With the Boost set on 2 (30% I believe) and turning on the controller with the manual operator (minimum) you should read 3.6 Volts for 2 seconds - then it will turn off.
Terryallan
Explorer II
Oct 17, 2013
Dial in more power. To just before lockup with the manual handel.

Also. I wouldn't use WD40. I use electronic contact cleaner.

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Prodigy P3 Issues

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