The issue was the negative battery terminal. I also replaced the pink relay but this did not solve the issue, but I couldn't replicate the clicking noise again from the relay after replacing it (maybe a seperate issue?). You can see my thread on club Lexus
http://www.clublexus.com/forums/sc430-2nd-gen-2001-2010/844131-sc430-parasitic-battery-drain-fuse-47-radio-1-30amp-removed-wont-start.html
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