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Originally Posted by richtazz
All the circuits you're having problems with are Ignition switch controlled, so I wouldn't rule out a bad ignition switch/harness assembly. This is a very common issue on GM W-Bodies. The contacts get weak and start arcing, causing all sorts of random electrical anomalies.
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thats also true but the ignition switch runs on a diffrent circuit compared to the other systems that are connected to the BCM which are having an issue, no starting complaints, but i have seen an issue w/ dash problems with bad igniton switch one time.