Part time light stuck on

[JIMMYRIG]

I have dana 30 with cad delete and i believe an np231 transfer case in my 89. I used to be able to engage/disengage 4x4 and the part time light would correctly reflect that. After engaging last night its now stuck on. Its the first time I engaged since plugging vacuum lines. Would the lines have any affect on the switch? Or could it just be a stuck switch or wiring gremlins?

[Eagle_SX4]

Yes the switch is vacuum powered so whatever you did to plug the Vacuum lines has caused it to supply vacuum to the switch when 4x4 is engaged but not release the vacuum when 4x4 is disengaged. 

 

The switch is located on the firewall below the HVAC blower motor. 

[JIMMYRIG]

Ok, phew! Thanks. So is there any negative to leaving the line unplugged that way the part time light actually still reflects t-case engagment. And is there a safe way to test that the front axle is engaging properly without jacking up the front wheels?

[Eagle_SX4]

2 hours ago, JIMMYRIG said:

Ok, phew! Thanks. So is there any negative to leaving the line unplugged that way the part time light actually still reflects t-case engagment.

If you want the factory switch to still function you will need to completely reroute the vacuum lines to delete the CAD portion and just use the vacuum switch on the transfer case to switch the light on and off. It is possible but I don't have any tips on the best way to do that.

2 hours ago, JIMMYRIG said:

And is there a safe way to test that the front axle is engaging properly without jacking up the front wheels?

Not really that I know of. Unless you get stuck and watch the front wheels spin. Or get stuck in 2wd and switch to 4wd and see if you can get out.