Question about 2004 Dodge Ram 2500

3 Answers

My 2004 Ram 3500 has all of the rear turn signal and brake lights working just fine, but when I hook up my 5th wheel lighting cable to the truck's receptical, the trailer's rear left brake and turn signal do not work. I have verified there is no power coming from the truck's receptical. I am told by a Dodge dealer that the engine control unit is faulty and needs to be replaced to the tune of 500 dollars! Is this really possible the ECU controls the receptical for the trailer lites?

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  • mikesrv6a Jul 12, 2010

    I have had the same problem when hooking up to other trailers.

  • mikesrv6a Jul 13, 2010

    Does anybody know if the trailer lighting is controlled through the ECU on a Dodge Ram?

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3 Answers

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  • Master
  • 2,272 Answers

Every part which is electrical is controlled by ecu.But if the receptical is not letting the rear brake and turn signal light to function.Then its either the problem of connections or the rear brake and turn signal wires are getting connected to receptical in between.Remove all the connections and reconnect and recheck. To check the wiring for receptical.Please click on the following link below:--
https://app.qleapahead.com/rtp/LibraryGet.aspx?asset=70980,98 Its mentioned on first page. ---------- Thanks.

Posted on Jul 13, 2010

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  • Dodge Master
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Actually, now power at the receptical could mean a broken wire somewhere in the manufacturing process or damage due to use.

Have an auto electirc shop chase the wire down or determine what exactly is bad.

The ecu may have something to do with it in some cases, but I'm not sure in your case.

good luck fixing it.

Posted on Jul 12, 2010

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  • Dodge Master
  • 22,095 Answers

No something is amiss here ,i would rewire the the rear of the truck socket and use relays that are operated by the existing truck lights ,but a 12v supply through a fuse direct from the ignition side of the ignition switch ,right must go we have just won the world cup and its like world war 2 london blitz got to go and join in with the neighbours.

Posted on Jul 11, 2010

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