We had an electrical fire in the engine bay in the middle of a couple of hundred acres of very dry wheat stubble due to short in the pull-in solenoids on the fuel pump on the Cummins [ R62 ] Sheer panic occurred almost to the point of needing a change of under wear! Finally got the battery cable off the terminal on the starter which stopped the power that was keeping the fire going. learn't our lesson and put a heavy duty truck type isolator switch into the battery cable under the batteries and above the rear RH wheel where it is fully accessible from out side the engine bay. When welding, leaving the combine overnight, storing the combine at the end of the season and giving it a regular run while in storage, charging batteries, working on any of the electrical circuits and obviously if there is an electrical fire or a short circuit then it is merely a case of giving the large T handle or removeable key in the isolator switch a quick twist and the batteries are fully isolated. Would very strongly reccommend that all combines should have such an battery isolator installed. They cost very little compared to destroying an electrical system or a set of batteries or like us, [ almost ] losing a combine because you cannot isolate the electrical circuits. An alternative very quick to fit and cheap isolator type battery cable terminal with a easy to use twist down contact is readily available for 4 or 5 dollars each in most automotive shops in Australia and should be available in any automotive electrical shop in the USA. If not, you guys are slipping!! Cheers.