trying to help a buddy find a problem. 05 mastiff dies randomly. after reading countless pages on electrical problems checked lights on ehc only lights that work are igniton power up works when you hit starter button. no other lights work turn signals or horn even though all operate properly. it has what i guess is an igniton box (looks to be factory) with two lights one red (stays on with ehc igniton light) one yellow (comes on when started flashes with rpm (more rpm faster the flashing). on initial start up whily ideling tac maxes out at 7000. thanks in advance for any help