If theres a circuit/short/load causing battery current to flow, disconnecting or reconencting EITHER Pos or Neg terminal dont matter, you can still get a spark. That battery has voltage across its two terminals and dont really know or care which one happens to be attached to a huge hunk of iron that you happen to be using as a wire/circuit current return path.
I prefer to FIRST disconnect the NEG terminal (on Neg grounded vehicle) because if the wrench happens to touch the iron frame theres no sparks BUTTTTTTTT if you first put a wrench on the Pos post and it happens to touch the frame its SPARK CITY with possible high temps and arcing etc OUCH
Master disconencts can be good for safety and/or to prevent current drain butttttttt thats two more connections to go bad plus possible resistance/carbon in its contacts i.e. THERES NO FREE LUNCH
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