Ok I may be able to help as I have done this to a MX13.The first lot of wires are for the original Nippon Denso Alternator which you shouldn't need as you will have to make up another loom to run the 7M Alternator.The thick white wire is main battery power but as your car is LHD Im unsure as Im in Australia but it could be the wire for the output terminal on the alternator if its on the same side as where the original 2M alternator was.As to your starting issue go back and use the factory wiring to the starter and the new wire that you have used for the starter needs to be fed back to the factory starter wire as this also includes the start signal wire for the ECU for memory.
Cheers Brett.
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