Hi all Hope someone can help? Autotrail Comanche with total tow bar. Have got to France and found out that bike rack lights aren't working. Have checked all connections and all seems ok. Have tried to test with a bit of cable and a spare bulb and can't find 12v between any pin and earth, also tried another earth point. All lights on the van are working fine. Has anyone got any ideas? Strange that nothing works which would suggest loss of the earth connection?