my wires are cracked at the switch just like the 4 wd indicator switch do on the t case. Mine still works but do think for long.
The switch is located on the passenger side of the trans up high. It probably has a steel ball under the switch.
Rockauto has them on closeout.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.