The resistance to ground along an earth wire and through the bonding point on the chassis should be fractions of an ohm.
(It is common with most meters that even if you just touch the leads together you will read about 0.5 to 1.5 ohms - this is the resistance of the meter leads themselves and should be subtracted from the displayed resistance when you are taking a measurement.)
If you have a good earth, the meter should read almost exactly the same as it does with its leads shorted to each other.
Anything over about 3 ohms and I would suspect one of the connections to be defective.
Boots.
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2007 V70 D5 SPORT 150k
1997 V70 2.5TDI 290k - Sent on to pastures new!
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