ez jonny.
That small blue wire that goes to the alternator. My alarm must has something to do with it then?
If i disconnect, the engine will not start. No starter motor. the fuel pump primes up and ignition comes on etc but no cranking
The wire was corroded at the connector block which sits around near the starter motor. I replaced it with a straight wire.

Been ok though but this is why i mentioned the blue wire. im guessing its a fault with my electrics :embarassed: