[QUOTE=Vombil;99550
pos is 1x thick to starter and 1x thinner to alt input? There is a earth?? ( a very thin black wire) that comes out of the back of the alt (separate to thicker input) and runs back towards the starter and into the loom near firewall.

so i have 4. but not a -ve from batt to alt output[/QUOTE]

That's not quite correct.

The smaller red wire goes from the battery +ve to the alternator OUTPUT.

The alternator has its own earth thru its own metal case.

The very thin black wire that you mention is actually a brown wire & it is not an earth, it is the alternator light wire. It runs back into the harness to the "battery" light light in the instrument cluster.

Dr Terry