An Old project never completed to be done G4

[suicideneil]

That didnt make any sense at all sorry ( punctuation & grammar , you can't really connect anything up wrong unless you were trying to rewire the battery connectors ( there are only 2 plugs, a battery plugs into each one = simples ). The motors are easy to hook up, red and black wire goes to each motor & it doesnt matter which as they are wired in parallel. The only thing you could hook up wrong is the rx lead from the esc which has to be inserted the right wya around otherwise the esc just doesnt work ( no signal ).

Sounds like the smartstop was wired up wrong and shorted / the esc out...