Repair farberware FSU 255 coffee urn

Farberware FSU 255 coffee urn won’t stop perking. Replaced thermostat. Needed to remove piggyback connectors to get old thermostat out. Replaced connectors on wires and reconnected wires exactly as prior to removing the old thermostat. Plugged urn in, sparks flew out and tripped the breaker. Please help. Thanks Margie.