I have a 1995chevy tahoe

Posted by Lineman97007 on Jan 28, 2009

Yes the switch has to be operational for the actuator to function. A few easy steps to a speedy dianosis.
1- check the fuses under the hood in the relay center.
2- with the trucks 4wd engaged test the switch on the trans. There should be power to both legs of the switch. If not jumper the two wires together with a 10 amp fused jumper wire. Listen for the actuator to engage. If not verify there is power to the actuator on the front axle and that it has a known grounding source. check all grounds and power sources.