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Hello, if you can share the 17 digit vin number I can check for a few possible problems for this concern
Ok there doesnt seem to be any known issues for this concern for this model year vehicle. Are any of the warning lights on when driving the vehicle or everything works fine it is just an intermittent battery draw?
Ok then for some reason the instrument cluster is turning on which could be an issue either with the cluster itself or a short circuit in the smart junction fuse box in the right side kick panel, earlier model mustangs had issues with water leaks into the fuse box and could do similiar issues.
Right, the windshield cowl would fill with water when the boots would plug up with leaves and leak into the sjb. Unbolt the fuse panel and check for signs of corrosion or water intrusion to the connectors on the sjb
Ok thats all I can suggest other than having a diagnostic check of the vehicle done to see if the instrument cluster or smart junction box have an codes stored for relays that control either module to indicate which circuit to test. We do see lots of issues with the instrument cluster itself so next time the lights are on just try banging on the dash to see if the lights go out or flicker to indicate an issue with the cluster itself
No problem, if you need more help or information just let me know. If I was helpful please hit accept and leave positive feedback so I get credit for assisting you