Wish to put the above in context. I was having an intermittent starter issue with my 1968 spider AR1411625/1750 Webbers. Searching the bb I first put in the starter relay which the first time worked, then didn't a reminder that it was intermittent. Starts/clicks/nothing. Next stop was a new ignition switch-thank you Classic Alfa who also sent along where to attach the four wires- red, black, brown, green/black. Of course it has not solved the problem- most recently a hot Bosch Blue coil where green/black is attached to 15. Also now have a new starter from Classic. Tightened. cleaned grounds, got quicker taking of Webbers. Early on checked battery which was ok, but bought a new 24F for my Milano/75 and when installed it worked, but learned that 24's come in different heights 7-9in with shorter needed. On the original ignition switch a Bosch(unknown model) brown&green/ black attached to same lug. On the new Sipea red goes to 30 and black to 50, but now brown 54 and green black to 16. I'm out of ideas except my above request for a color wiring diagram. I've owned the car 35yrs with no wiring changes which looked original when I bought it running