2003 Jeep Wrangler 4.0- Complete System shutdown while rpms where high

2003 Jeep Wrangler 4.0- Complete System shutdown while rpms where high While stuck in the mud and rpms high... the entire system just shut off... The battery was still good as the winch was still working.. I turn key and nothing happens... not even interior lights... I checked battery connections and all is good with the battery.. Any suggestions...??