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Q: Draining battery on 2003 GMC Yukon XL 1500

For some reason my battery is being drained. I've already replaced the battery, alternator. I have noticed that the passenger seat warmer has not been working as it did. Sometimes it heats up appropriately and some times it does not. I am going to take it to a gmc service shop but since I know absolutely nothing about electrical malfunctions in a vehicle I would appreciate any insight that might be useful.
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had the same thing, the dealer had to change the dash cluster(gauges) at no charge . there was a problem with shaking levels.
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