For those of you with the Toyota 4runner factory towing package, there is a converter in the left rear inside quarter panel near the rear tail lights. Mine crapped out (luckily while still under warranty), and the right turn signal would not function when towing. Anyone else ever have this problem?

 

I believe there was a recall on the converter for the Toyota Factory Tow package. I don't know what years or models were effected though. At least yours was still under warranty.