Ramesh, recently I've converted my RX100 to 12v. How?
1. Things to buy - RXG wiring harness (Minda is one option or OE)
2. RXG/RX135 CDI (socket compatibility)
3. RDD Lighting kit or RX135 with RR unit.
To my knowledge if you have RX135 or RDD lighting kit with you, take it to the shop and buy the RXG wiring harness and check for the socket. Damn! I got clean bowled once.
I would suggest you to go read my thread for better understanding



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