So got the alternator in now, it all works as it should!
The only issue left is the belt palaver...
I ordered a new belt as the standard one from the other side was a bit small..
I ordered it 1mm wider and 2" longer.. Turns out as its wider and it fits to the same size as the original! :d'oh:
Then I ordered one 6" longer and 1mm thinner.. ITS HUGE lol.. way to long!
Ended up faffing about with all the belts I had spare and got one which was just long enough so the alternator will clear the heater matrix pipes behind.
With the wiring..
I took a spur off the wire that powers the rotor coil to start the alternator (from battery light) and added 2 diodes, one to each wire so the alternators don't feed each other when running, as this could cause it to either turn off or over charge.
The only issue with this is it takes a couple seconds to turn them both on as there's a very low amount of current going to the alternator in the 1st place and now its devided by 2!
This is so the alternator has just enough electromagnetic field to start itself without being to dificult to turn.
This could be overcome by allowing more current past the battery light by adding a resistor with the same (or similar) resistance value as the bulb in parallel with light bulb or a second feed from the ignition with sed resistor.
Then the outputs go to each battery which are not connected, everything that is powered from the 2nd battery like the lights which turn on from the main battery have a relay to switch it on so it remains isolated.
The earth's are shared.