So I have a MEP 802a that I have been rebuilding and was working on getting it started tonight. Turned the main switch to the heaters and a massive short occurred. Burnt up wires 109C from the starter to the K18 relay and 116C from the K18 relay to the heater plugs. Crispy, and lots of smoke. I suppose K18 is probably fried too. Does anyone have any ideas what might have caused this? Do I even need the heater plug circuit for it to operate? Also, wondering where to find out wire size so I can replace the wiring eventually.