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Message: <blockquote data-quote="KaeZoo" data-source="post: 1185946" data-attributes="member: 329733">You really need a multimeter for any serious troubleshooting.  A test light isn't accurate enough.Your problem could be caused by a loose or corroded connection at the battery, a defective or blown power wire fuse, or a loose ground wire connection.   I'd probably start by checking the battery connection, and replace the fuse on the power line near the battery, even if it looks good.A capacitor won't fix a power problem, especially in a case where the amplifier isn't even turning on.</blockquote>