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Message: <blockquote data-quote="Saint" data-source="post: 958624" data-attributes="member: 16561">Heard of this a bunchIt's the voltage regulator in your Instrument cluster failing....No bs google it. The part is no longer sold by ford your only hope is to get a new cluster or replace the components on the voltage regulator...eventually it will fry or simply fail causing a good alternator  to no longer charge the battery because the voltage regulator in the instrument cluster completes the circuit for the green wire coming off the alternator harnessI've seen guys cars sit for months over this best bet is to go pull a regulator from your year model at the junk yard. It's located on the back of the instrument clusterMy friend sanded every ground in his car and added grounds. Still had the lights dimming issue the culprit was the instrument cluster voltage regulatorOh and if you want to upgrade your alternator power wire: I snatched my old one out ( with the bs fuse links) and Used true 4ga wire with an ANL in-line fuse (200amp) closest to the power box and an Installation Bay fuse holder for the best heat ventilation I'll post pics tomorrow when it's not raining if you'd likeIf your battery needle isn't bouncing with the dimming your insturment cluster should be fine</blockquote>