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Your LF or LR running lamp bulb has a bad ground. The current flow is looking for ground. The current flows through the stop lamp filiment back to the dash cluster through the turn signal indicator bulb. It is finding ground at the dash cluster. Check your running lamp bulbs,sockets, and socket grounds. It could be any one of the three.
Doug



The fact that the fuel gauge is acting up indicates that the DASH CLUSTER is not grounded. There is probably additional grounds. I'd pull ALL the harness grounds--headlights, parking, tail, etc, dash, where-ever else you can find a ground, pull it loose, grind it bare, and remake the connection. Pull the kick panels--I don't remember if there are any in there--and look up around the dash. Inspect things like the heater/ wiper motor, etc.