while driving down the road at 60 mph my 1993 toyota camry automatic lost power had to coast to side of the road. lights stereo ect. worked but when i turned key to start it - it made one single click

I hope you got home OK. But first I thought main "mega" fuse. but lights work, so no, not that. I don't know if your car will run with the battery disconnected or not, some will, some not. Couple things. Put your battery on a trickle charger over night, (before you do that if your battery is more than, say, 5 or 6 years old forget the charger and buy a new battery.) But if it's a toddler or so, new to 3 years old, do the charger and make sure the terminals are corrosion free, squeaky clean. Might just solve it if your battery was corroded and while driving it finally lost conductivity and your car died. other train of thought...are you absolutely positively 100% sure your gas gauge works on a 20 year old car? maybe it reads falsely that you have gas but you simply ran out. But I am led away from that and back to the battery because if the 'one click'; try the charger and clean terminals. Let us know what happens, if that does not do the trick we will explore some other things, good luck

I'm with David. The only things that would stop a car and prevent a restart is a car that won't run on alternator alone and a dead battery. Get the battery and alternator checked out.

agree with these guys, check the battery for corrosion, loose battery cables, etc. and also the alternators output. if your alternator isn't producing the proper output you'll lose your battery charge and get the result you have experienced. HTH good luck