Having taken the advice a few posts down to buy a multimeter which I will I was just wanting to confirm the process of testing the batter and alternator. I've been googling the group to find out so just wanted to run it by someone to make sure I'm am carrying this procedure out correctly.
Battery test: Engine off, disconnect positive clamp on battery (does the neg one need disconnecting?) set multimeter to 20amps ? is that on DC, or AC ? then put the black negative lead on the neg battery terminal and the red one on the positive terminal and watch the display for a reading of 12.4v?
alternator test: same as above except turn every electrical gizmo on and get someone to rev it and hold it at 2000rpm while doing the above and I should be getting 13.4v?
Please correct me if I am wrong and advice or explanations welcomed :@)