What is the generally acceptable duration for the GP light? Here in NC it has been getting down to 40s at night. The GP light is staying on for maybe 5 secs, but my SD is running rough on cold start as if some GPs are not on. Now, I have been letting them glow for 30-60 secs before cranking. Still rough idle until heat is built up. I know I need to ohm them out. Is a shorter duration due to less resistance from opens in one or more of the GPs?

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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi