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Howdy! It looks like you've got some nice rides! Once I bought my first '89 2500 back in 2020, I knew I couldn't go without one anymore. Not sure exactly what it is, but I can't get enough of 'em. A buddy of mine bought a '73 C10 a couple years back out near your neck of the woods, too.
I think the pump is still good. I think it's an electronic issue. Sometimes with key "on", everything works and the pump will prime, then when I try to start it, it won't crank. I try it again, and then the door buzzer and pump won't even work. I replaced the ignition switch and ignition control module, but still no luck. Regardless, the lights all work, but the power windows won't. Maybe it's a ground issue, maybe it's an ECU issue? I'm going to dig around on here and see what I can find, and maybe start a thread about it if I can't find anything.
