1990 735iL Tail Light

[razimm]

I need help with a right side tail light problem. (The left side works fine.) There is only 9 volts at the bulb terminal, without the bulb, which then drops to zero when the bulb is inserted. The fuse is good and measures 12 volts, so somewhere I think there is a poor or corroded connection. The tail light wire has only 9 volts where it enters the trunk. I don't have a wiring diagram and would appreiate any suggestions on where to start looking.
Thanks, Rudy

[richard morris]

Hi, my RHS tail light would go off unexpectedly, and then come on later. It was suggested that the mustard coloured relay in the fuse box is the problem. I followed the given instructions, re-soldered the lugs on the back of the resistors and so far no more problems. the link for the info is
E32 Soldering fixes - LKM & Mustard Relay

All the best Richard