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All the troubleshooting in the world will not solve a battery that is past its service life. MAKE SURE the battery is good before you start pulling fuses/checking for excessive current draw. After a good load test shows the battery is good, the next step will be going through the steps to sequentially locate any excessive load where it shouldn't be. I haven't yet heard of anyone having more then one problem component but it is possible (like after a bad spike from, say, a jump-start gone bad). Good luck!
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