I believe, if it were mine, I'd replace a few bulbs first. That's the cheapest way to throw a few parts at it to see if it'll clear up. Replace every piece of glass in the circuit. I've seen some strange things happen to vehicles with a squirrely bulb.

If that fails, then go after the relay.

Hope you find it. <img src="/forums/images/graemlins/wink.gif" alt="" />

87 Montero, bought new, by me -
88/89 intercooled Starion Turbo engine-
with awesome audio.