Parts Needed to Add a 7-Way Trailer Connector to a 2011 Toyota Sienna

Question:

I have a 2011 Toyota Sienna, and I need to install a round 7 way wiring connector. I use the 7 way plug to power running lights, break lights, turn signals, and to charge the trailer battery off the car alternator. From reviewing your website, I planning to use a T-One Connector code 118498 to connect to the Sienna circuit. This should provide the break, signal, and running lights. It also states I need to connect a 12V source. I also plan to use Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector Code: 30717 to provide the 7 Pole connection for the trailer. I will need to connect the 12V source to provide power to charge the trailer battery. Does this make sense? Please confirm the part numbers for a 2011 Sienna.

asked by: Joseph M

Expert Reply:

To start, you would need the T-One Connector w/Upgraded Circuit Protected ModuLite, # 118498, to first provide a 4-Way flat trailer connector at the back of your 2011 Toyota Sienna. I have included a link to the installation details for reference.

With the 4-Way installed, the next best solution would be to install a 4 and 7 Way Installation Kit # ETBC7. This will provide a 7-Way connection (while still retaining the use of the 4-Way flat) and it provides all of the wiring and circuit breakers needed to make the 7-Way fully functional. The only other part you would need is a brake controller if the trailer has electric brakes.

The 4-Way installed first, will plug into the back of the ETBC7 and there will only be 4 wires left to hardwire to the vehicle. White grounds to the vehicle frame. Purple goes to the reverse light circuit. Blue goes to the blue wire on the brake controller (if needed). And black connects to the positive battery terminal via a 40 amp circuit breaker. I have included detailed FAQ links that explain the installation of an ETBC7 kit.

The 12 volt circuit on the 7-Way can be used to provide a maintenance charge to the trailer battery, but the wiring is not large enough to effectively up charge the battery. If you plan to use the 12 volt circuit as a maintenance charge line, I recommend installing a Battery Isolation Solenoid, # PK5231201, in line on the 12 volt wire so that the trailer battery will not drain the vehicle battery when parked.

If you decide to use a brake controller, I recommend the Tekonsha P2, # 90885. This is a proportional controller that engages the trailer brakes in proportion to how hard or soft the vehicle is braking. It is one of our most popular controllers because it is easy to set up and easy to use. I have included a link to the installation details for it as well.