I have noticed a number of inconsistencies over the years with the glo light. On nearly all occasions, it has been necessary to replace a glo plug. If your multi-tester reads that all are fine, I wouldn't worry too much about it.....especially if the car is functioning well now.

After all, the light indicators and guages on these beasts are not the impressive part of the car.

diesel don

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed