A quick question. If you leave it running without the key for around 20 seconds ish does it stop? Could be a short in the ignition switch between ignition and retained power? Usually if you shut off truck power stays on for a bout 10 or 20 seconds. Or until you open a door. If this was the case it could be feeding ignition power over to the ignition side? Hope that helps.
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2020 GMC 3500 Denali Dually Duramax 6.6
2013 Fuzion 342 ToyHauler (Ours)
2011 Harley Davidson Streetglide custom (Mine)
2012 Harley Davidson TriGlide (Trike) (Hers)
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