snake, actually, if the indicator stays on whenever the parking lights or headlights are on, then it is supposed to indicate a bad bulb...however, a faulty ground will do the same thing too.
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From page 68 of my 69 GMC Owner's manual A light flashes to indicate proper operation of the front and rear turn signal lamps. If the indicator lamp remains on and does not flash, check for a defective signal lamp bulb. If the indicator fails to light when the lever is moved, check the fuse, and indicator bulb.
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