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Trailer wiring to satisfy a Cayenne's computer?

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Old 04-09-2018, 04:59 PM
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Rod Croskery
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Default Trailer wiring to satisfy a Cayenne's computer?

I worked all afternoon yesterday with an electrician in an attempt to wire the lights on the trailer for my UTV in a manner that my '04 CS with factory hitch would tolerate. While his Dodge Journey had no problem with the trailer lights, Ruby would repeat the "Check Trailer Lights!" warning, with a loud beep, at frequent intervals. I put Ruby back in the garage and hitched up my 4 cylinder Tacoma for the haul today, but for heavier loads I need to use the Cayenne. Could it be a programming problem with the computer, or do I need to wire my trailers differently?
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Old 04-10-2018, 12:11 AM
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Tom M
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Have you used this trailer before? If not, are the lights incandescent or LED?
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Old 04-10-2018, 12:12 AM
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jeff spahn
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Does your trailer have LED lights? There is an adapter made by Curt for our vehicles for them that is supposed to help. I have it but haven't tried it.
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light adapter
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Old 04-10-2018, 12:27 AM
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Rod Croskery
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Tom: I have used the tandem trailer to carry my Polaris Ranger and general cargo since I hired a welder to build it in 2010.
Jeff: They are conventional incandescent lights. I helped my son put resistors on the LEDs on his car trailer. They work. These don't.
Ruby doesn't mind the lights on my boat trailer, a factory job.
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Old 04-10-2018, 04:31 PM
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aftCG
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The "check trailer lights!" alarm comes up and yet the lights work fine on any trailer I've ever pulled. Sometimes HAL just needs to STFU
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Old 04-10-2018, 06:27 PM
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Rod Croskery
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In this case Ruby would sense the light bulbs and immediately refuse to illuminate them. We even put an extra ground on the left rear to see if that would help. Not with Ruby, but the Dodge liked it.
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Old 04-11-2018, 11:39 PM
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jeff spahn
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Originally Posted by jeff spahn
Does your trailer have LED lights? There is an adapter made by Curt for our vehicles for them that is supposed to help. I have it but haven't tried it.
No affiliation

light adapter
I tried it today. No more check trailer lights warning. That thing works.
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Old 04-15-2018, 09:31 PM
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dasams
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Bosch electronics as used on the Cayenne, X5, ML, Audi, etc are not LED aware. They expect a current pull from incandescent lights and if it's not there, they assume the light is burned out. Then they cut power or do weird things. This is what you want
https://www.amazon.com/gp/product/B00C4AYR3U/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B00C4AYR3U/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I realize you don't have LED's but give it a shot. GL, dave

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Old 06-13-2018, 12:54 PM
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MR Turco
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Bumping this thread. Curious if anyone has used the tow ready adapter over the CURT (wondering because the form factor is better).
Amazon Amazon

I'll buy whatever works.
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Old 06-13-2018, 01:33 PM
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vandal968
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MR Turco,
the adapter you listed has happy reviews from Touareg owners, so I'll go out on a limb and say that it probably works fine with the P!g. If not, Amazon has free returns....

cheers,
c
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