Quote:
Originally Posted by brentbarrie
I thought it did? I don't wanna, get shocked lol
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You are correct, from a safety perspective it does make a difference.
If you accidentally touch any metal surface on the trailer while hooking up the + with the - not yet connected, then absolutely nothing happens as the battery circuit is not complete. If you touch with the - attached already, then you complete the circuit and short the battery. Note that the reverse is NOT true, hitting metal while hooking up the - with the + installed does nothing, you are simply shorting ground to ground.
Also note that when making the final + connection with - already in place that you will generally get arcing as the circuit is energized. Although not overly dangerous, it can be startling. You do not generally get arcing when the final connection is the - terminal.
In neither case are YOU likely to get a shock, but it is safer for your battery and your systems to make the negative connection last.