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I have a 2004 Dodge Ram 2500. When I plug in my trailer the park lights work but my turn signals and brake lights dont work on the trailer. They work on the truck. Can anybody help me with this.
 

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Start with a fuse check. Then go to the connection box on the truck and check it for power out of the leads. If they work then it's in the trailer. Let us know if you need more info. I will return with an entry from my black book of info.
 

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does your trailer have a seperate bulb for turn signals? what about your truck? if your truck does but your trailer doesnt or vice versa sometimes that will cause the issue.
 

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If all the lights are working OK on your truck... I would start from your trailer harness plug in on the truck.
Use a test light or malty meter and test your contacts at the plug at the trks back bumper. (I'm sure they're fine) Most cases, it's usually the wiring on the trailer that has the problem.
Keep us updated on your progress.
 
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