Transfer Case Indicator Lights Hookup
(snip)
11. To wire the relay, find a 12v positive source. The wire for the cigar lighter comes from the GEM and will work for this. Wire the relay as follows-
12v + to the 85 post
Connect the wire from the transfer case that comes on when in 4 low to the 86 post
Connect the wire from the transfer case that comes on when in 4 high to the 30 post
Connect a wire from the 87a post to the wire that goes to the 4 high light
12. Connect the wire from the case that comes on when in 4 low to the wire that goes to the 4 low dash light.
The way this works is, the ground from the 4 low signal trips the relay, cutting the signal to the 4 high light. The 4 high light now only works when in 4 high.
Thats it, put the radio and bezel back and your done!