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Old 02-21-2009, 11:29 AM
diesel don diesel don is offline
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Join Date: May 2001
Location: Michigan
Posts: 1,373
Agree with previous post.

If my memory serves me, the number one plug is often the problem related to the light.

I gave up years ago and simply bench tested them. There is no rhyme or reason to the crazy things. One may last 5 months and another 10 years.

What really, really helps however is to determine which ones to bench test. For that simple exercise, I pull the cap off on the relay, put the multi-meter into each hole (red) while grounding the black on the engine block. In that way, I often only have to bench test one plug; at the most two.


Diesel Don
'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)

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