I had no problems with adding a switch to mine (Power Pro). Mine flashes a fault code when I have a bad connection. Usually a fuse holder get corroded a little and causes the fault.
Adding a little wire length shouldn't matter since you can buy a 10 foot extension battery cable (to battery) and the charger still works fine.
No make sense.
I solder all my connections. I do not trust crimps. I do use crimps on a temporary basis.
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