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Old 01-07-2020, 08:48 AM   #1
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Tekonsha Brake Controller issue

Installed Tekonsha Primus IQ and pigtail plug for the Freightliner XC chassis on my 04 MADP.

No red light shown when trailer is plugged in.
Red light comes on when brake pedal is applied but doesn't activate brakes.
With flashers on, controller blinks and shows multiple diagnostic codes

I am assuming the pig tail is not wired correctly for my chassis.

Some chassis in 04 wired differently?

Anyone have experience with this issue?
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Old 01-07-2020, 09:04 AM   #2
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A tester would help.

https://www.amazon.com/s?k=trailer+p...b_sb_ss_i_2_13

It might be possible that dealer interaction is required to turn on that feature in your vehicle's computer.

Tom
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Old 01-08-2020, 05:07 PM   #3
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Quote:
Originally Posted by tdcolby View Post
A tester would help.

https://www.amazon.com/s?k=trailer+p...b_sb_ss_i_2_13

It might be possible that dealer interaction is required to turn on that feature in your vehicle's computer.

Tom
Thanks for the reply.

Spoke with Tekonsha tech support: ď 04 was first year pigtail was available for FL XC chassis. You may need some of the wires in the plug relocated to match the chassis harnessĒ.

Thought the harness was plug and play. Guess not.

Evidently not all 04 model year plugs were the same? Guess I will have to get underneath the dash again with a test light and see whatís what.
Might remove the seat this time. I am big and the space is small!
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Old 01-09-2020, 06:00 PM   #4
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I had a similar problem on my '06 DS. Two wires in the Spartan chassis pigtail were mislabeled. After talking thru my wiring with Tekonsha tech support, I switched the 2 wires and the controller worked fine.
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Old 01-11-2020, 07:43 PM   #5
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Quote:
Originally Posted by Vake View Post
I had a similar problem on my '06 DS. Two wires in the Spartan chassis pigtail were mislabeled. After talking thru my wiring with Tekonsha tech support, I switched the 2 wires and the controller worked fine.
Thanks for that valuable info! Do you recall which wires you changed on your Spartan Chassis?


Tekonsha tech told me they didnít consult with or have any input from FL, but put out the pigtail to satisfy many RV dealer requests for one. I didnít get any info from them on which FL Chassis they used for a base prototype.

04 XC Chassis might be an outlier.

I bought trailer plug test light and hope to get the issue handled soon.
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Old 01-11-2020, 07:53 PM   #6
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Quote:
Originally Posted by Vake View Post
I had a similar problem on my '06 DS. Two wires in the Spartan chassis pigtail were mislabeled. After talking thru my wiring with Tekonsha tech support, I switched the 2 wires and the controller worked fine.
Just noticed your signature!

I tow a Corvette too (C7 Z06) in 24í Rance V-nose aluminum trailer.
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Old 01-15-2020, 02:50 PM   #7
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Pigtail for Controller

Accessed the FL pigtail today, one of the pins from the controller goes into an empty hole on the FL chassis plug. That could be my issue, will use my tracer tomorrow and try to track down the correct wire.

The owners manual shows a picture of the trailer plug at the hitch. The picture shows the traditional spot (about the 4/5 o'clock position) blue wire as the trailer brake power feed. It also shows FORD only.

So does that mean the blue only works on the Ford gasser chassis?

At the 2 o'clock position it shows AUX. TOW CONNECTOR "PREP".

So do I need to source brake controller power from the 2 o clock position?

All comments advice welcome !!
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Old 01-16-2020, 02:46 PM   #8
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Quote:
Originally Posted by speedway View Post
Accessed the FL pigtail today, one of the pins from the controller goes into an empty hole on the FL chassis plug. That could be my issue, will use my tracer tomorrow and try to track down the correct wire.

The owners manual shows a picture of the trailer plug at the hitch. The picture shows the traditional spot (about the 4/5 o'clock position) blue wire as the trailer brake power feed. It also shows FORD only.

So does that mean the blue only works on the Ford gasser chassis?

At the 2 o'clock position it shows AUX. TOW CONNECTOR "PREP".

So do I need to source brake controller power from the 2 o clock position?

All comments advice welcome !!
This diagram is pretty standard across all brands.

The blank one is for charging a battery on your trailer or providing 12 volts to your trailer,

Trailer brake position is the same across all trailers.

NOTE colors only will vary.
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Old 01-17-2020, 12:02 PM   #9
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This may be a dumb question, but... My experience with Tekonsha was with one of the original Prodigy controllers. Are you just hitting the brake pedal while parked and looking for the signal or are you hitting a manual test button. Without the accelerometer sensing slowing down in addition to the brakes being applied, I didn't think it would apply the trailer brakes. If I am out in left field someplace, forgive the intrusion. As stated before, the Blue wire on the 7-way plug is normally your brake signal. It should be off the brake pedal switch, that only gets power when the brakes are applied.
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Old 01-18-2020, 01:03 PM   #10
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Issue solved (I hope!)

Thanks to everyone for the sharing your info and expertise.

As I suspected the pigtail harness from Tekonsha was not a match for the FL brake controller plug.

After some time at the coach with Tekonsha tech support on the phone I was able to rearrange the packard connections in the plug to match up to the proper wires in the chassis loom.

FL Chassis plug has 5 wires in it, (the brown one is for a backlit display which I didn't need). Tekonsha pigtail has 4 wires.

Of the 4 wires in the Tekonsha pigtail, 3 were in the wrong place.

We moved them to match up with the proper wires and the controller display is working, showing the correct screens and timing out the power as designed.

I won't be hooking up the trailer until this Friday (I store it at a different location so its not readily available), but don't expect any problems as I have power for the brake circuit at the plug.

Electrical systems on the motor home are alway an adventure!

Again, thanks very much!
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Old 01-18-2020, 01:09 PM   #11
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Issue solved (I hope!)

Thanks to everyone for the sharing your info and expertise.

I suspected the pigtail harness from Tekonsha was not a match for the FL brake controller plug.

After some time at the coach with Tekonsha tech support on the phone I was able to rearrange the packard connections in the plug to match up to the proper wires in the chassis loom.

FL Chassis has 5 wires in it, (the brown one is for a backlit display which I didn't need). Tekonsha pigtail has 4 wires.

Of the 4 wires in the Tekonsha pigtail, 3 were in the wrong place.

We moved them to match up with the proper wires and the controller display is working, showing the correct screens and timing out the power as designed.

I won't be hooking up the trailer until this Friday (I store it at a different location so its not readily available), but don't expect any problems as I have power for the brake circuit at the plug.

Electrical systems on the motor home are alway an adventure!

Again, thanks very much!
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