I installed an aftermarket Curtis trailer hitch and wiring harness on my 2008 liberty. After I got it all wired up only the passenger side blinker and brake lights will work. I've checked the fuses under the hood and they're fine, then I checked the 4 pin connector coming from the jeep and only the passenger side is getting power. My ground should be good because I sanded off some paint right behind the tail light to ensure a good ground. Are there any fuses hiding somewhere that I should check? This is driving me crazy. Checked the trailer lights and they work fine on another car so I know it's not them. Any help would be greatly appreciated. Thanks