The car with the original car battery powered electric winch, winch negative (black line) and ground wiring directly connected to the battery negative what is different, what effect can you have?
Ground wiring is convenient but there are some contact resistance, voltage loss. Direct connection to the battery anode is a bit troublesome, but there is no voltage loss.
The power consumption of the iron is relatively large, and (you also know that the wires are not iron)
The iron easy wiring caused by poor contact directly connected with the battery power good
