Hello, I am a first time owner of a 742b bobcat with mistubhishi gas engine and was searching my manual and don't see anything about the purpose of the 3 prong plug in back. It looks like plug goes to a pump that has either the hydraulic lines going through it or cooling lines. At first I thought it was a block heater but this doesn't appear to be the case. I'm not sure if this is a aftermarket part put on since I cant find anything about it in manual. I did plug it in the pump or whatever it is got warm but didn't know if machine needs to be running when plugged in. Any help would be greatly appreciated. Thanks Jason