Hi Jim,
You wrote:<<Sure. The quick way is to pull the plug off the GP relay and
use a
DMM to measure the resistance to ground of each one. The rated value
is 0.6 ohms, though it can vary with temperature. The important part
is that they all be about the same.
Even better is to use a hefty ammeter to measure the current to each
one. I just did that on the 190D a couple of days ago. Within a couple
of seconds each one dropped from about 28A to under 20A, except for the
bad one that was drawing about 2x normal current. (_That_ is a weird
failure mode.) Most people don't own an ammeter that is good for more
than 10A, however.>>
Got my 2 new GPs today so tomorow I'll try to find out what the problem is.
To refresh memory - I have new GPs and new GP relay - preglow light goes out
within 1 sec. of turning the key) I got my DMM out and set it to
Resistance - using a new GP I touched the threads at the top and the threads
that contact the cylinder head - got a reading of .3 - then I crossed the
leads and the reading was .0 - is it OK that my DMM doesn't have a reading
greater than .0?
How do I tell if my DMM will measure current in the range you mentioned --
I'm thinking I need at least a 30A max? But I think my DMM is good for
0A's - it's from Radio Shack --
Oh well, tomorrrow I'll check the GPs and see if any are much different from
each other -
Thanks -
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
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