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My 2003 Silverado 1500 won't shift in to 4x4, I replaces the actuator, switch, and transfer case control moudule and had it reflashed. When my mechanic tried to install the new encoder motor he manually shifted it to neutral and then once installed the truck was stuck in neutral, wouldn't even go into 2hi. After doing a little trouble shooting he said its experienceing a voltage drop and only getting 5V not 12V so the encoder motor's brake won't relaese. All the fuses look good? If there something I'm missing? A vaccum line? Or could it be just a loose wire or connection?

I really need help guys, Thanks!
 
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