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Message: [QUOTE="Iso-baric, post: 1566845, member: 32327"] Headlight flicker was a symptom in my case, not the cause. Root cause being dirty voltage output from the alternator due to a diode failure. Any sensor that uses a 5v reference can be effected by 'noise' in the 12v system - ICP/CPS/MAP/EBP etc. It takes <5min to do a diode test if you have access to a multimeter. Or you can simply disconnect the hot wire from the alternator and run the truck for a short period of time to see if the issue persists. [/QUOTE]

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