A bad fuse could be the cause. Will it start? Is there a security light on? Does the horn work. Sometimes a battery change can trigger an alarm system. The clicking could be a horn relay trying to beep a broken horn. Next to the battery is a power distribution center. It has severla relays in it (black squair things) Pull the relays out one at a time and see which one is clicking. There should be a lable on the cover that will tell you what each relay does.
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