rgatijnet1 wrote:
Since you know the third brake light works, why not just run a new wire from the third brake light down to the wiring assembly at the rear of the coach where the trailer pig tail connects? Sometimes it is just easier to run a new wire than to try to find the problem in the old wiring. It doesn't matter whether the wiring was chaffed, corroded, or eaten by rodents, if you just unhook the old wire and install a new wire.
Basically, that is what I will eventually do if there is not another easy fix for this issue.