The 4 wheel drive indicator light was burned out, I replaced it and it still did not come on, I noticed in the manual there is a wiring diagram(8W-23) that shows a 4x4 indicator switch on the front axle, do I need to have the hubs locked in to get the light to come on? I thought the transfer case switch(8W-25) was all there was. (it's raining so I am asking here instead of getting wet)