this is a 63 c 10. the dash turn signal indicator is a shared bulb left and right. the instrument panel harness is original wiring. the rest of the truck is American auto wire. the turn signals are wired as shown in the 63 c10 schematic. (attached) the truck electrical works perfect except the right turn signal. both front and trail light blink but the dash indicator light does not. if i put my test light on the bulb my test light blinks bright but the bulb is very weak. take the test light off the bulb goes out. i have grounds from the batt to the engine, frame, firewall, and dash. what am i missing?