In order to maintain the battery on your trailer battery I would add the wiring harness to your 2006 Subaru B9 Tribeca. To be clear, the power from your vehicle will not be able to charge the battery, only maintain it. If you need to charge your battery you will need a charger like the # CTEK56353.
You will have to start by adding a 4-way. I recommend the T-One Vehicle Wiring Harness # 118461. This will plug into the connection point in your rear cargo area. I would also choose the Tekonsha... view full answer...