hello all! so i just bought this dumptruck and i was welding a plate on the back to attach a pintle hitch i had the battery unhooked i hit the end of the welding rod on the yellow wire of the trailer plug and it arced then when i hooked the battery up the left turn light stays on changed all the burnt fuses and there is still 3.6 volts coming through wire. any ideas would be appreciated. the truck wiring is all good just the trailer plug is doing this.