[Vwdiesel] Glow plugs

Roger Brown r.c.brown at ieee.org
Sun Jan 18 14:47:16 EST 2004

Dan Stock wrote:
> I already checked the glow plugs with my multimeter
> and they are burnt out (all of them).  I have 4 used
> ones that test good but just want to find out what
> burnt them out before hooking up the new ones.  Is 45
> to 50 seconds to long for them?  If so, is it the
> relay that controls how long the plugs get voltage?

On-time will vary with engine/coolant temperature and whether its a fast of slow glow relay.  Glow plugs do wear out with use.  Off-brands seem to burn out faster than a good brand like Bosch.  The glow plug relay does all the logic of turning the plugs
on, turning off the pre-glow LED, turning them off and in some applications, turning them on while the starter is cranking.  I have more information on testing the various compoents on the web page I posted earlier.


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