What is your question?
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What is your question?
REPLACED ALL BULBS FRONT AND BACK TURN SIGNALS BLINK FAST WHEN LIGHT SWITCH IS TURNED ON WHEN ITS OFF THE SIGNALS WORK FINE.
What makes this problem better or worse?
WHEN HEADLIGHT ARE TURNRD OFF
How long has your 1998 Chevrolet C1500 had this problem?
FEW WEEKS
When taillights AND signal lights are in use - the GROUND circuit is not sufficient enough to carry all of the current. Turn taillights (headlights) off - GROUND circuit ok for signal / brake lights. Just replace both rear taillight circuit boards! Happy motoring! 🍀