Question about 1991 Chevrolet Silverado 2500

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I need to know were to hook up the speed wire on the truck there are three wires on my tac a ground a light wire and a wire that was hooked to the negative side of the coil on my old truck i need to know were to hook that wire i putting it in 91 silvarado

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It should be the white wire going from the distributer to the coil.

Posted on Aug 02, 2009


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There will be a black with tan wire at the blower resistor. This is the wire the HVAC control head grounds to turn the fan on high speed. With a test light hooked to power unplug the resistor, set the blower speed to high, turn the key to the run position. the test light should turn on when you probe the connector. If it doesn't pull the control head and back probe that same wire at the back of the control head with everything still plugged in. If the test light again does not illuminate the the control head is bad and not providing ground

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