โJun-26-2019 06:03 PM
โJun-29-2019 11:19 AM
โJun-29-2019 08:54 AM
BFL13 wrote:Thanks for that! Below is a photo of what the GM plug looks like. It also has a connector/plug that connects the truck's wiring harness to the plug. So that's another set of contacts that can go bad. Not a great design electrically speaking. Going to try and find a new 7-pin plug and hardwire it into the harness instead and eliminate a potential source of a poor connection. To heck if I'm going to pay the GM dealer the $100 Can. they want for a new one.
Here is that colour code info--note the table for GM, Ford, and Dodge.
Drive you crazy matching with the standard 7-pin colours and the way the OEM is in two parts facing in the middle while the end of the outer part faces the trailer.
http://www.iegtoclub.com/Tech%20Lib/trailer_wiring_information.htm
RCMAN46 wrote:Yes, have been using it for checking the output current and voltage. At first I was only getting about 0.4 amps, now I'm getting up to around 14 amp when I use the manual lever. What I'm not sure why is that the voltage still reads next to nothing while it looks okay at the back of the truck.
The P3 has a whole host of diagnostic features. Such as it will tell you what the voltage and current that is being delivered to the trailer.
Have you used any of the diagnostic features?
โJun-28-2019 08:09 PM
โJun-28-2019 07:43 PM
โJun-28-2019 07:20 PM
โJun-27-2019 08:31 PM
โJun-27-2019 08:22 PM
Bud
USAF Retired
Pace Arrow
โJun-27-2019 07:22 PM
โJun-27-2019 09:43 AM
myredracer wrote:stallsmi wrote:This is a thought I had too. The contacts in the truck's connector aren't corroded, but definitely dirty and were full of dust. There is a cleaner tool but is expensive and probably cheaper to just replace the connector. All the lights on the back of the TT work great though.
I had pretty much the same problem with my TT and a Ford F250. Turns out the problem was with the 7 pin connector on the truck. After having the brake controller checked, the brake wires completely re-done, I swapped out the connector and everything worked. I got a new connector from etrailer.com.
There's also some connector blocks at the rear bumper near the connector. Not sure if they're related to the 7-pin connector but also another possibility.
โJun-27-2019 09:26 AM
BFL13 wrote:GM stopped providing a plug a number of years ago and just provided some "cut" wires under the dash. I phoned Tekonsha to ask them. I still had the adapter plug with wire connectors at one end from when we bought the P3 two trucks and 7 years ago.
Some brake controllers have an "adapter" wire set needed, which is different for each brand of truck. No idea if this is the case here, but OP went from Ford to GMC.
โJun-27-2019 09:19 AM
stallsmi wrote:This is a thought I had too. The contacts in the truck's connector aren't corroded, but definitely dirty and were full of dust. There is a cleaner tool but is expensive and probably cheaper to just replace the connector. All the lights on the back of the TT work great though.
I had pretty much the same problem with my TT and a Ford F250. Turns out the problem was with the 7 pin connector on the truck. After having the brake controller checked, the brake wires completely re-done, I swapped out the connector and everything worked. I got a new connector from etrailer.com.
โJun-27-2019 08:26 AM
โJun-27-2019 07:08 AM
โJun-27-2019 04:33 AM
myredracer wrote:
Went for a test drive today and the TT brakes just aren't working right. When I pull the manual lever, the TT barely slows down. I jacked up all the wheels and pulled the breakaway pin. Brakes all work, but they're not clamped as tight as I thought they ought to be. Should it be possible to wiggle the wheels at all?
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