I have a 2008 Dodge Ram that came with the tow package. When I plug in my 7-pin trailer (with electric brakes) everything works fine until I turn on the truck lights. When I turn on the truck lights, I loose both of my turn signals and brake lights on the trailer. The running lights stay on. I unplugged the brake controller and still have the same problem. I compared my trailer plug diagram to my trucks manual and everything appears to be wired correctly.

Round 7-Pin Wiring Diagram

• ? White Ground.
• • Brown Taillights.
• • Green Right turn / brakes.
• • Red Auxiliary power.
• • Yellow Left turn / brakes.
• • Black Reverse lights.
• • Blue Electric brakes.

Trailer Wiring Diagram and Installation Help - Towing 101

One of the vehicles would also need to be fitted with a electric brake controller. If the Tundra already has one fitted then the answer would have a 99% chance of yes.

The trailer plug wiring just taps into the truck harness to the rear lights so if the truck lights work, the problem is in the wiring, not a fuse.

some van don t have a ground wire. hook up to trailer put jumper cables to frame of trailer and van if works install a ground wire plug

If you have your owners manual it will be in there.

Most likely the brown wire from the trailer connector is connected to a constant battery voltage source, and it should be connected to the vehicle running light circuit, however someone might have wired the trailer connector up that way on purpose so that the trailer does not draw power from the vehicle running lights and possibly damage the vehicle running light circuit. (Dodge/Chrysler vehicles do have delicate lighting systems) Here are some images to help assist you, and the 4 way connector is the same as the 5 way connector just without the blue wire for the trailer brakes.

Well let me shed some light on this issue. I have the same problem. Trailer connection from truck does not have power to left turn signal and left brake light. I just got back from the dealership and $100.00 labor charge. My problem is the TIPM (Fuse Box for short) and FCM (little silver module hooked to the Fuse Box on the left hand side of the fuse box). $910.00 for the parts and Chrysler doesn't have any in stock. 4-6 weeks to maybe fill a back order. I am currently researching an alternative way to fix this issue. I will let you know.

You have got 7 pin trailer connector that was included in the optional trailer tow package. This trailer tow package also includes an electric trailer brake wiring provision that terminates at a connector located on top of the large body harness connection under the instrument panel to the left of the break pedal, as well as an electric trailer brake pigtail harness and an instruction card that are stored in the glove box when the vehicle is shipped from the factory. You will need to add an electric brake controller of your choice that will plug-in to the harness and that will also give you power on your auxiliary circuit.

Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. With the tow package, there should be a plug under the dash... far left above the emerg. brake petal. The harness that plugs into it should have came with the truck, or you can order one to fit it. Did thew truck come with a 7 pin plug on the back? If not you can order one from the above mentioned site. They also have the wiring colors.

If you have a seven pin connector in your tow package, you should be wired for electric brakes. just need the brake box.usually in your owners manual it will show you where to plug the box into. the best thing to do is contact your local chrysler dealer and ask them.if you give them your VIN number they should be able to tell you for sure.