Yes, I've said I'm going to test across the battery and will also test the output from the alternator. If I find 14v on the output of the alternator this will mean a fault is in the charging circuit. My question was; what are these plugs? And where/is there sockets to accept them? Are they a part of the charging circuit? I hear on a C2 there is a warning light that will come up if the charging circuit has failed(?). This means something must come through the firewall related to the charging circuit? But is this the whole charging circuit (to say, an ammeter? where the break could be?) or just an indication from the ECU or a fault relay? Cheers, Gary