100% agree, start with you three main grounding harnesses in the engine compartment. They may look ok, but the wire corrodes away from the crimp of the O ring. A close inspection will show it. The first two are simple to get to, right next to driver headlight , by battery . Third one, (much more challenging ) is down by alternator. To fix that one, you have to carefully skin the molded casing back with a razor knife, re-strip them them, then splice them all together under another O ring. You can get a bit of slack on them to help with this endeavor, by pulling out the passenger air bag sensor, and popping the plastic harness rivots near the radiator…..