Just put new taillights on my 73’ Dodge B300 based winnie. I’m getting turn signals and running lights to the back, but only the passenger side brakelight is working. I ran all new wires to the taillights so the problem is up front somewhere. Any ideas?
Check to see if the emergency flashers work ok in the back. The trouble could be with that switch or possibly with the turn signal switch since the brake light circuit runs through them.