<<<It's a GE 36V 450 Amp forklift controller but should work fine on a E-cycle
or go-kart type vehicle. Currently it's going for $50 with no bids.
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1610552455>>>
Label has separate field and armature ratings, so I assume it's for a shunt ("sep ex") motor?