mfoster711 wrote:
Chris Bryant wrote:
Often there will be a separate feed for the front run from the junction of the umbilical cord and the trailer.
So what does that mean?
Follow the cord from the truck. Where it arrives at the trailer there is usually a junction box. Likely the one running light circuit from the truck splits into separate wires for the front and rear lights. The front wire may be bad. Also like another posters suggested, the ground may be bad. You can test by using a piece a scrap wire to jumper ground directly to one of the lights. If that doesn't work, try jumpering from the battery positive to the hot lead at one of the lights.