Question about 2003 Chevrolet Trailblazer Ext
There is a relay switch box under dash. But there is also a vacuum diaphram in the passenger front fender, which operates the front axle, that turns the light on and off along with the cable movement. Also there is a vacuum switch on the transfer case. When you flip the switch it sends the vacuum to the switch on transfer case which allows the vacuum back to the diaphram to pull the front axle cable. I would check for the vacuum lines first.
Posted on Jan 26, 2009
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Posted on Jan 02, 2017
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