Escort Mk6/55D Reversing Lights Work Intermittently

[mickmk6]

hi all after a lot of bother with the back lights re soldering all the wiring loom to the tow bar ring everything worked spot on ..

now (few days later) i think the switch has gone for the reversing lights they work intermittently ..but where is it.. iv looked in the normal places for one ,, cant find it..any help would be much appreciated.. mick.