[kltarga72]

Give our host Pelican Parts a call they may have a diagram for your 1973.5
Also check out this link
https://www.google.com/search?q=1973.5+porsche+911+alternator+wiring+diag ram+for+replacement+alternator&sca_esv=8df951587e50b476&rlz=1C1VDKB_enUS1167US1173&sxsrf=AE3TifNII4H3cXmXW8xYHNuu44eGD2nHyA%3A1765157 966249&ei=Tiw2aaz4DrzT5NoPsd_oyAI&ved=0ahUKEwis17Ps7ayRAxW8KVkFHbEvGikQ4dUDCBE&uact=5&oq=1973.5+porsche+911+alternator+wiring+diagram+fo r+replacement+alternator&gs_lp=Egxnd3Mtd2l6LXNlcnAiRzE5NzMuNSBwb3JzY2hlIDkx MSBhbHRlcm5hdG9yIHdpcmluZyBkaWFncmFtIGZvciByZXBsYW NlbWVudCBhbHRlcm5hdG9ySPpkUPscWLs8cAF4AJABAJgBpAGg AdoEqgEDNC4yuAEDyAEA-AEBmAICoAJ0wgIKEAAYRxjWBBiwA8ICBxAjGLACGCeYAwCIBgG QBgWSBwMxLjGgB-gJsgcDMC4xuAdswgcFMC4xLjHIBweACAE&sclient=gws-wiz-serp