OK, just yesterday, turned the key on my SDL and no glow plug light.

I know, I know,.....check the plugs, check the relay, check the fuse. Well.... all the plugs were changed approx 6500 miles ago. Found two bad and changed them all for the heck of it. Just so ya know.

The car starts perfectly fine as it has for the last 22 years. No ruff idle, no hesitation, no spitting, no coughing ..... no nothing. Just Perfection starting and running.

Question: And I've searched. Has anyone ever-ever tested JUST THE BULB ???

How do I test just the bulb and absolutely nothing else. Oh,.... without taking the cluster out.

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1986 SDL
My Other Car is a Porsche. When it stops leaking, I'm out of oil.