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    1990 k1500 sierra 4wd will not work

    hello I'm new to the forum. I have recently purchased a 1990 gmc sierra k1500 and the 4wd will not work I have purchased a new thermal actuator and have voltage (12v0lts) at actuator connector. still no 4wd. my question is does the rwal have any bearing on 4wd operation. the brake light is on...
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