On both my 95 SR's the ignition switch wore out. Not to say that's your problem, but it is common. The part that houses the electrical contacts is plastic and unscrews from the back of the tumbler. Not too expensive IIRC. I was able to clean mine by dissasebling it but it only bought a month or so time and I replaced it with a new part.

99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..