[Vwdiesel] Glow Plug Question

[Val Christian]

I have fast and slow which are silver.  Cycle times vary with coolant
temperature.  My understanding is that there are three speeds.  The middle
one is interchangable.  The fast relay cycles in about 6 seconds at
100F.  The slow relay cycles more like 15 at 100F.  The differences are
much greater at colder temps.  I can't find my notes where I took several
data points.  Glow plug brands draw somewhat different currents.

If you have a fast and a slow side by side, and you put 12V on them, it'll
be obvious.  Sorry I can't be more definitive.



>
> > I just bought a rebuilt cylinder head and it came with new Glow Plugs.  The
> >  problem is, that I do not know if they are fast or slow.  To make things
> >  worse, I do not know what system is in the truck I bought either.
> >
>   When looking at the washer-like part, just beneath the buss bar
> threads, on the glow plug, note the color:
> Silver is slow
> Brass is fast
>   You'd need the part number off of the relay or cycle it through, with the
> temp sensor connected but not the plugs, to be safe.  Slow will click
> off in about 40 seconds and fast in 15 to 20.  Anybody have the actual
> times on those?
>      Loren
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