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The GMT800 Silverado/Sierra 1500 and 2500 (non Heavy Duty) (light pickup trucks) were released in 1998 as 1999 models.

front 4x4 actuator ground

I transfer case control motor will shift into four low but I can't get the thing to shift into too high or four high I wonder if it's the ground on the front actuator

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Hi @cp5408

It could be a faulty transfer case shift control switch.

Here's the wiring diagram from the 1999-2005 Sierra service manual that may help.

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chuck paskach will be eternally grateful.
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