Similarly to the earth also check the other end of the power cable. It attaches to a single bolt on the battery side of the firewall. Also check how well the cable is installed into the battery clamp. If wiggling the positive terminal is causing the inside lights to flicker (along with all your other symptoms) then I would drive to the nearest Auto parts store and buy a replacement positive lead. It's about a foot long with a battery clamp on one end and a eye on the other. It'll cost 10 bucks and will probably solve your issue.
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