Cannot see an earth strap from above-can only see a short way back along the aircon compressor before pipework etc gets in way-and unable to get a clear view from underneath at present.Don't have[as has been suggested]any jump leads to try that.Had a look at KW's guide but can only do a few of the checks as I don't have access to help.The results were battery at rest 12.79,engine running at its start up speed[just over 1,000 revs]14.79,engine at its normal tickover[about 500revs or just under]14.45 engine at tickover-lights on and heater on lowest setting 14.39 rising to 14.7 when engine revved by hand[to I'd guess somewhere around 2,000revs.Rev counter still not working-needle fluttering at bottom of gauge until engine stopped when it jumps to registering about 100revs[this drops back to O when ignition turned back on.All 3 fans still turn on all at once when temp gauge registers 90 temp will then drop to about 88 but the fans remain running until after engine switched off.