...on the trailer. It's weird, the indicator stops working when you put the bulb in. Got the multimeter out, checked power is running through and that the earth is fine. It has a reading when the bulb isn't in, as soon as you put the bulb in - nothin. Tried a few bulbs, tried the same bulb in the brake light and it worked fine. The brake light earth runs off the same as the indicator too so it's not the earth. Anyone shed some light on this one? It's got us puzzled! All readings are fine until the bulb goes in!