Electrical Gurus..PLEASE help

[Bamamax02]

Here's my situation. I recently did the DRL on with the parking lights with the Diode. Yesterday the diode blew because of that weird deal with relays being in backwards in some trucks. Well it was raining yesterday so I decided to replace some blown interior lights. I popped open my 4wd selector and soldered some new "backlight" bulbs. I got the part number from some thread about interior lights, they were 12volt Radio Shack part #272-1092 micro lamps. Here's where it get interesting. I plugged it up to see if it worked and when I cranked the truck up none of my dash panel lights were lit. Even the radio display was blank but it played music and worked. Gauges worked along with, info center, cluster warning lights, and 4wd selector led's worked. This was with the headlights on.

Now when the headlights are off, the radio display comes on. All other lights work fine no matter if headlights are on or off (dome light, ashtray light, courtesy lights under dash, door panel lights, map lights etc.) The only thing that doesn't work is the backlight for the radio, radio display when headlights are on, HVAC, Gauge Cluster, Headlight Switch, cargo light and fog light switch, and 4wd switch. I have triple checked all fuses underhood and side of dash with a fuse probe and all are good, i even pulled everyone and inspected them. Everything else on the truck works fine headlights, DRL's, etc etc. Did i short something on the 4wd switch soldering those lights? Electrical stuff isn't my cup of tea so I really need some help with this. :thinking2:

 

[Bamamax02]

If someone could send me the wiring diagrams to those components above I would greatly appreciate it :thumb: BTW my "Illumination" fuse on the underdash panel is getting no power, the fuse is good though.

 

[Chevy1925]

unplug the 4wd selector switch from the wiring harness and then turn the lights on and off and see if they work normal again

 

[Bamamax02]

I went and bought a new 4x4 switch because, like you, I thought that was my problem. But that didn't fix it. I did notice that when I had my test light and I had my old switch that I could touch two solder points together on the connector pins inside the switch and all the lights came on, but they stayed on even when the headlights were off and they also didn't dim with the dimmer switch.