People on the Cummins forum say there are some welding cables that work well.

Here's one guy that makes them for sale. I've heard good things about his builds.

Heavy Duty, Aftermarket, Custom Battery Cables for your Car, Truck or RV

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.