Having had to replace my offside rear light cluster due to a stone entering the cluster and letting in water I was checking the lamps and found the bottom connector faulty ( the contact had broken). To get over the problem I managed to get hold of a similar socket from an automotive part supplier ( it was a Sunday). I snipped off the faulty one and wired in the replacement and all seemed OK. On checking the light I then noted that when I turn on the RH indicator ( or hazard lights) the reversing lamps also lights dimly. If I remove the right hand indicator bulb the fault disappears. Replacing the bulb reinstates the problem. Normally this would indicate an earthing problem. Please note This is not the lampholder I replaced. Any ideas anyone?