thanks for the replies the age 2001 the cars charging system is fine 14.6v,the autolec left his super duper meter that records fluctuations, across the battery for 28 hours he said obviously he has more than one meter, result only dropping 0.25 or .025 amp cant remmember, which is what the onboard computer consumes. he advised and showed me how to do the fuse test which he said is really time consuming because theres 50+fuses and many relays, on three levels of the fusebox which has to be stripped out of the dashboard to get at the second and third layers and that sounds a bit daunting to me.So its back to my trusty old battery chargers which are in third position for most used tools behind 13mm &10mm spanners and screwdrivers.
ps dont buy one of these in line fuse checking devices if you have a diesel because you have to swich ign on & off with every test that means you have to disconect the glow plugs because they drain the battery quicker than anything.