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Don,
You can test them in place. their resistance should be very low. On the order of 1 ohm, give or take, depending on the accuracy of the meter. Most handhelds aren't that accurate at that low of a range. Don't use a continuity beeper, most will beep with resistace as high as 40 ohms.
There is a connector that you can disconnect that will give you access to the plugs via the wire connecting to them. You can check the resistance from the socket in the connector to the engine block (or head). Check them one at a time, or check each plug at the threaded tip with reference to the block.
Good luck
__________________
Michael LaFleur
'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)
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