Switched the starter, still not starting

[bigbadjohn666]

Please excuse me if I don't state the Mk of my Supra or what engine model engine it has, I have only just bought it. Its a 1990 3.ltr Turbo Manual, Bought it from my father inlaw with 60K on the clock, quite tidy and I love it.

I have a starting problem where the car starts easy and runs great, but when you stop and try to re start all you get is a click from the dash and nothing, if you wait anywhere between 10 mins and 90 mins (erratic) it will start again no problem

Is my problem the thin blue wire and do I need to do the relay conversion ? how easy is it to do and where is the starter motor located ?

Any help would be very much appreciated as its driving me crackers.

Sometimes the car will start as many times as you like with no problem, its erratic but sounds like the wire to the starter motor from what I have read ?