Just needing some help

Okay, update... got car running great, idle is a little high but I can work with that. Headed down the road for a test drive and all is going well then 45 minutes from the house she shuts off like someone just disconnected all power from her. No power at all, nothing works(lights, radio,flashers, nothing)$275 for the cheapest tow truck. Anyone have any ideas? The persons house it is at said I could leave it there for a couple of days and try to get it going before towing it