Agree with all that the best approach is to use a relay as described. I will add that you might want to consider adding a marine fuse box in serial with the relay. They are very cheap to buy, and give you the ability to then independently add multiple additional fused circuits very easily. It will also allow you to clean up the rats nest tap in approach that many of us have on our carts. Coming from motorcycles, each of those tap in connectors is an opportunity for issues down the road. If I have to tap into a wire, I've had good luck with Positap connectors, or often splice/solder then liquid tape seal the connection.
There is one additional solution, albeit more expensive and overkill for most. They sell smart fuze boxes that can be wired directly to the battery, then a single wire to switched power --- no relay needed. The boxes then use a phone app to set up each port/connection, and you have full control of each circuit. This comes of value say if you wire in Christmas lights and want them to stay on for say 1 min after you switch cart off. Tons of flexibility, and can be very cleanly installed --- but often overkill. I've used the Neutrino smart box in the past, but there are several available.
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