2017 toyota corolla will not start

#1
i dissconnected battery because we were replacing and weldind a new rear quarter on, plugged battery back in and no crank and no start, no dash lights, no headlights but i do have flashers???? any ideas?
 
#2
you should have disconnected the engine computer along with the battery, you likely fried the computer-not cheap, but check all fuses and relays and all grounding wires first.
 
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