Well im off to my next task on my 780 and its the drivers side floor board light, it will not illuminate normally ( Door Open Close ), I pulled the unit from its hole and have Zero across pos/neg, so i checked POS to Brake Pedal ( Ground ) and it illuminated, now my question, i pulled the carpet and followed it into the wire harness then pulled the fuse panel up to see the wire continue to what i think is the passenger side floor board ( i havent pulled the carpet yet ) anyone have any clue of the wiring or per say operation of these light's? the passenger side light works fine. Im thinking somewhere along the line the light has to intersect with the door switch but where, the Door's Red Light Work's as well as the interior lights when the door is opened.

Problem Solved, I was able to bypass the original Neutral wire going to the floor board lights by running a new line from the Neu on the light to the Neu on the door switch, now the lights comes on and off when the door is opened and closed.

Thanks for posting the solution. Haven't had the problem but could...those are funny little lights. What year is your 780? I'm on my 2nd '91.

Patrick

Its An 89