93 GMC K2500 Diesel electrical issues

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Slicer89

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I have a 93 GMC K2500 6.5 Diesel... It has a few weird electrical issues.

I'll start, Batteries are brand new and I've checked those connections and they are clean and tight.

What's going on is, whenever I turn on my headlights my gauges go wonky. They move up or down a little from the normal positions. When I turn the lights off, my gauges go to a more "Normal" position (The only two gauges not affected are the tach and speedo)

Also; Whenever I turn my turn signals on, especially on the highway the speedo will jump around when I first click the signal on, but goes back to normal afterwards

Also; The passenger side window doesn't work from it's own switches... Works fine from the drivers side - If I use the switches on the passenger side door, all the gauges will jump around until I let go of the switch.

Any ideas?
 
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