Tekonsha P3 problem

Thanks for the reply & suggestions.

I've checked & all wiring seems ok except 5mm from the Battery to the brake controller. And the brake controller is at 80deg top to bottom but dead straight left to right.

I checked & found that when I slide the manual brake lever at the bottom of the tekonsha It pumps out 5.5amps @ 11.5 volts (not sure if this is a lot?) when I go under the camper trailer I can hear the brakes buzz & I measure 2.5amps to each wheel..

Cheers Don

Don't forget to check the ground connection back to the car. When you apply the electric brakes all the current from the brakes and the brakelights all return through this circuit. I recommend running a ground from the trailer plug to the battery.

With the motor off, the controller will only see (and use) battery voltage. Try running your tests again with the motor running.

2.5 amps at the magnet is good (not excellent), it should stick well. Sounds to me like the controller is o/k.

i only just fitted a new P3 controller in my 120 prado and had no issues at all. actually worked very well compared to the voyager i had before in a 90 series.

Could it be worth trying sitting the P3 unit horizontal somewhere near the gear shift just to check its nothing to do with the angle. I doubt it is but you just never know.

I think i told you in a previous post i ran the red cable direct to cable on rear LHS light not switch or plug pin. it was my first time installing one (always thought it was a harder job - would be i think playing wioth the brake switch due to the physical position of it) I also used good size cable just in case, but a local auto elec did tell me he never does, never has and it made no difference and "to save my money for something else" when i went in to buy larger size cable from him. So I went elsewhere and got larger cable size i wanted to use, so hopefully its nothing to do with cable size based on his advice to me

good luck and hope it sorts itself as it is a good controller based on my limited experience....

Try adjusting trailer brakes seems a logical thought.

Thanks for feedback I will have a go at the suggestions this week sometime.

Just another question after I scroll through the troubleshooting menu on the P3.
With Van connected to car - Tekonsha P3 unit connected and full manual control voltage set at 13v. Amperage output indicated at full application reads 5.5 A.

Is this the Maximum a P3 can output or is it determined by how much it can draw from the battery or the amount the electric brakes are able to draw.
I never checked this when it was installed in my previous car so can't really tell.


thxs Don

I have a Prodigy and it only has about 3.5 on the screen when hauling the van up hard.

As long as it works is all I worry about.

I do have twin 6mm wiring from Blue wire to rear of car so as to minimise voltage drop Van has 6mm to each brake but then it weighs 2800kg.

My P3 is set somewhere around 6.something (cannot remember) and noticed it shows up under 3 when stopping. Actually found using the manual lever stopped me harder (higher number) for some reason - thats not the boost button. Actually found it great going down steep hills etc using that to keep things smooth.

I would check all wiring and position of unit if the brakes worked ok before they should now so can only think its in something you done. Mine I simply plugged in after wiring up and off i went. Worked like a charm and can see no reason yours cant too, cheers....