whiew, at least it's not a oil question...
the dash gp light, is just an indicator that the plugs are mostly working. it has no bearing on how long the plugs are energized. properly working the light should indicate the absolute minimum glow time. when it's cold, I let the gp's run the full time they can. if you listen you can hear the relay click when it is done.
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!