February 23, 20224 yr Rear tail lights work when parking lights are turned on. No tail lights when headlights are turned on. The parking lights and headlights use a different fuse and relay. I swapped relay with no change and all fuses are good. oddly the wiring diagram just shows two wires from the headlight switch - one to ground and one to MB-14 “tail and illumination relay”. Seems odd it doesn’t trace it all the way to the light fixtures. Tried a different relay in tail relay in the engine fuse box and it made no difference. gonna buy new bulbs and relay any suggestions?
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