Just cleaned up the main earth strap from the battery which go's to the inner wing then to the engine & then cleaned up the earth next to it that go's from inner wing to engine but the bolt on the inner wing sheared off:doh so repositioned it onto where the main earth strap bolts to the body. I haven't touched the earth strap from the alternator bracket as i'm 100% sure that bolt will also shear off but a few months ago I added another earth strap to the alternator bracket which is easy twice the size of the factory one:augie
It's to dark & foggy to check the earth's with a multimeter now but will tomorrow but I would have thought you would get a zero reading whilst cranking the engine
If you check with the ohms setting, you should get zero, but at the currents used to start even the tiniest of resistance readings could cause volt drops. The problem is, most multi-meters are not capable of reading accurately to that sort of tine resistance.
If on the other hand, you set the meter to voltage, and connect one lead to the engine, and a second to the body, if there is a resistance, the current drawn by the starter motor will show up as a readable voltage across the earth lead.
Having said that, I would be looking at Earths relating to the central locking unit and ECU, rather than the engine, as you have said the car is cranking fine so less likely to be the main earths.
I did this list for Alex of other earth points, but it is not compleate.
http://www.nissan4x4ownersclub.com/forum/showpost.php?p=277859&postcount=22
Finding these earths are fun from the pictures though, but maybe you will have more luck locating them.
From a quick look, these would be my starting point.
M846 Very likely N/S, possibly near Wiper Motor Page EL256
M845 Very likely N/S, possibly near Wiper Motor Page EL256
M33 Possible O/S Wing in front of fuse box. Page EL256
M754 Possible O/S Foot well, behind kick panel Page EL258
E222 Possible O/S of engine block Page EL227
E224 Possible O/S of engine block Page EL227
