To learn more (perhaps more than you really wanted to know) about the VW diesel glow-system, visit Roger Brown's excellent page: http://4crawler.cruiserpages.com/Diesel/CheapTricks/GlowPlugs.shtml From whence I quote: "So you have the little yellow glow plug LED on the dash, why do you need another glow plug light? Actually, the LED on the dash has nothing to do with the glow plugs. Its just an output from one part of the glow plug relay, which takes the temperature sender input and produces a delay to let the glow plugs reach the proper operating temperature. The glow plugs themselves are powered by a relay which is operated by a different part of the relay circuit and they generally stay on for a time after the LED goes out. If the coolant temperature is warm enough, the glow plugs and LED won't be turned on at all in the "glow" position of the ignition switch. However, the glow plugs are always turned on whenever the starter is operating, regardless of temperature. "By running a wire off the glow plug bus bar to a light on the dash, it will be possible to observe when power is actually reaching the glow plugs directly. This indicator would be useful to diagnose a number of glow plug problems." IIRC, the Bentley specifies that--assuming a cold engine--the glow plugs should continue to glow for 30 seconds AFTER the engine is running, although the dash indicator will have gone out long before. Jeffrey Earl 1983 diesel Westfalia "Vanasazi"
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