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Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
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This is really sounding like a bad ground to me, too.
Here's how it works: Suppose your turn signal and sidelight bulbs have a common lead to ground, but that ground is bad. Current from the turn signal will then go back through the sidelight bulb and find its way to ground through a combination of the tail lights, license plate light, and maybe even the panel lights. Since the current splits between all of these bulbs, there may not be enough to light any one of them. Or, you might see a dim glow in some.
You can follow this on a wiring diagram.
To find the culprit, measure the voltage between the grounded side of the turn-signal bulb's socket and the chassis. Obviously, this should be zero, but if not, the ground is bad.
Here's how it works: Suppose your turn signal and sidelight bulbs have a common lead to ground, but that ground is bad. Current from the turn signal will then go back through the sidelight bulb and find its way to ground through a combination of the tail lights, license plate light, and maybe even the panel lights. Since the current splits between all of these bulbs, there may not be enough to light any one of them. Or, you might see a dim glow in some.
You can follow this on a wiring diagram.
To find the culprit, measure the voltage between the grounded side of the turn-signal bulb's socket and the chassis. Obviously, this should be zero, but if not, the ground is bad.