Quote:
Originally Posted by tangofox007
The fault detection function should not be measuring anything once the preglow sequence has been completed. Also, the lamp indicates a fault by not illuminating.
Why was the relay "showing the GP light on the dash?"
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Because, unlike your incorrect statement above, the relay is always looking at resistance in the glow plugs. With a bad glow plug, I've had the GP light cycle on and off while driving, many times. Change the gp, solve the problem.