Blinker won't shut off...¿

I have recently started working on my friends newly aquired 1974 2002 and the passenger side blinker won't shut off. I was wondering if anybody had the wiring daigram for the car so that it will be easier to trace¿ Any help will be very much appreciated. Thanks.
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the blinker relay is probably stuck.

I think that you need a new blinker switch inside the car. I had the same thing, with the high beams on my 74. It was about 100 bucks at bavarian autosport for a new one. I bet you can find one cheaper at a junk yard though...if you can find one.