There could be many reasons for your heat build up on the SB connectors. The most prevalent reason that I`ve run across is resistance in the cables due to discoloration due to corrosion. Theres a Billy Joel song that states "you cant go the distance with too much resistance".Check your charger cables and battery cables for wear,Also remember that there is a neglected connector on the truck side that is usally never even considered as heat source. Be sure to crimp or burn your connector tips properly when replacing them.
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