trailer wiring problem

[bwestfall]

Hi all, time to bring up wiring for a trailer again. (loren thanks again for the wiring diagram)

2003 cayenne S with dealer installed hitch and programming. I have a boat trailer with surge brakes and LED lights. I have the uhaul 7pin round toi 5 pin flat adapter already with the built in resistors for LED lights.

The problem - I have RT turn, LT turn, Running light, Reverse signal (to turn off the brakes while reversing), but NO BRAKE LIGHTS.

Fixes - Went to a hitch place - the pollak reciever had a missing / corroded pin on the back - replaced

- also, the contact for that missing pin was disolved on the cayenne harnes - replaced this connection as well

Still no brake light. Does anyone have any ideas?? (dealership is 4.5 hours away)

THanks

[JeTexas]

Hi all, time to bring up wiring for a trailer again. (loren thanks again for the wiring diagram)

2003 cayenne S with dealer installed hitch and programming. I have a boat trailer with surge brakes and LED lights. I have the uhaul 7pin round toi 5 pin flat adapter already with the built in resistors for LED lights.

The problem - I have RT turn, LT turn, Running light, Reverse signal (to turn off the brakes while reversing), but NO BRAKE LIGHTS.

Fixes - Went to a hitch place - the pollak reciever had a missing / corroded pin on the back - replaced

- also, the contact for that missing pin was disolved on the cayenne harnes - replaced this connection as well

Still no brake light. Does anyone have any ideas?? (dealership is 4.5 hours away)

THanks

Do you have portable lights or something you could plug in to see if the fault is on the car side or the trailer side? Or just a multimeter to see if you're getting power on that pin from the Cayenne when you hit the brakes?

[bwestfall]

Hi all, time to bring up wiring for a trailer again. (loren thanks again for the wiring diagram)

2003 cayenne S with dealer installed hitch and programming. I have a boat trailer with surge brakes and LED lights. I have the uhaul 7pin round toi 5 pin flat adapter already with the built in resistors for LED lights.

The problem - I have RT turn, LT turn, Running light, Reverse signal (to turn off the brakes while reversing), but NO BRAKE LIGHTS.

Fixes - Went to a hitch place - the pollak reciever had a missing / corroded pin on the back - replaced

- also, the contact for that missing pin was disolved on the cayenne harnes - replaced this connection as well

Still no brake light. Does anyone have any ideas?? (dealership is 4.5 hours away)

THanks

Do you have portable lights or something you could plug in to see if the fault is on the car side or the trailer side? Or just a multimeter to see if you're getting power on that pin from the Cayenne when you hit the brakes?

The trailer lights were fine on my f350. When I use a test light on the trailer side of the uhaul adapter, I get turn signal/running/reverse - same as the trailer, but for some reason, the brake is not triggering the lt/rt turn leads. Not sure if this is a problem with the module.

[lmritter]

Greetings:

Check the bulb.....no joke....start at the beginning and move back...also check to see if the unit that contains the bulb on your trailer is grounded. I've towed boats and trailers for 35 years...this ALWAYS WORKS. The bulb back......, ie bulb,....grounding,.....break in wirings, harness etc

Good luck

Chromedome

[TyS]

On 7/9/2008 at 5:50 PM, bwestfall said:

The trailer lights were fine on my f350. When I use a test light on the trailer side of the uhaul adapter, I get turn signal/running/reverse - same as the trailer, but for some reason, the brake is not triggering the lt/rt turn leads. Not sure if this is a problem with the module.

Did you ever resolve this?  I'm having the exact same issue on my '09 Cayenne.  I have running lights and both turn signal lights, but nothing on Pins at 3 o'clock and 9 o'clock with brake activation.  I thought the brake module needs to be coded, but I don't have electric brakes, only surge.  I've ruled out my trailer as well.

Edited June 7, 2017 by TyS