Allis-Chalmers offered an optional Auxilary Power Outlet which was located back on the rear end of the Tractor. Popular models such as the CA, WD45, and the Industrial B came with this option. Over time, the wiring to the  outlets got damaged, or torn off never to be put back on. Here at B&B we have a simple ATO fused repair circuit kit to connect to your existing outlet.  Another original from B&B!