Actually, if I may suggest do not alter within the fusebox. A new original Fiat provided relay will again work for a couple of years. Or try locating a similar terminal one of a better brand within India. What you should do I think is modify wiring so that ignition key will kill all connection from battery/alternator to relay to AC. I am not an expert in this area, but this is what was done to Siena along with some more modifications to make things fool-proof.