My wife and i just bought a 2001 suzuki xl7 with 68000 miles, tested everything signed the papers. dealer installed a gps cutoff switch. After that it would hesitate starting when you turned the key
Drove it about 200 miles in a week drove it in to town in a rain storm, parked at a gas station and the car wont start, turn the key and nothing, all the lights come on and the radio displays SYS, but no clicks, no start
please help

21

If the issues started right after the dealer installed the GPS cutoff switch, then I'd say they messed something up.  Take it back to the dealer and have them fix it.