phatton Posted March 20, 2019 Share Posted March 20, 2019 The part time 4 wheel drive light in my 90 Comanche seems to be tied into my a/c, vent, heat and defrost switch. In 2 wheel drive, when I turn the switch to the off position the part time 4 wheel drive light comes on. If I place the switch in any other position the light goes off. The light does come on when I shift into 4 wheel drive. I believe that the heat and defrost run off engine vacuum - could I have a common vacuum line going to both the switch and the light? How do I tell? Any ideas? Thanks Link to comment Share on other sites More sharing options...
JMO413 Posted March 20, 2019 Share Posted March 20, 2019 This is the switch that's turns the light on. It's on the passenger side inner fender very close to the firewall. Link to comment Share on other sites More sharing options...
phatton Posted March 23, 2019 Author Share Posted March 23, 2019 Thanks Link to comment Share on other sites More sharing options...
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