The "shunt" provides a high voltage relative to standard shunts, so there is no easy substitution unless also replace the gauge. A new cable with good ends should run cool and be accurate enough for the tractor (and its less than precise gauge).
New disconnect switches are listed here: http://electrictractorstore.com/index.php?main_page=product_info&products_id=116 and although not listed I can provide the cable if desired. On 7/5/15 4:50 PM, Chris Tromley wrote:
Is the power disconnect switch a known failure point, as in still functioning but increasing its resistance? Should its resistance be measurable? Or did years of corrosion raise the resistance at that end of the cable? If the fuse wire just normally runs hot, has anyone replaced the whole shebang with a breaker that would run cooler? What parts would be needed?