i have a 1998 baja hammer with a 7.4l mercruiser, i'm chasing what i beleieve is a short or broken wire which causes me to have a no-start condition. absolutely nothing at all , no clicks , no lights, no anything, i cant even get bloer or anything to work even with charger or jumper cables hooked up. then all of a sudden it gets power and cranks right up...no rhyme or reason...it's driving me nuts. any ideas on were to look for a short or wiring diagram? i'm pretty sure it is a short though, when i hok up the charger it is sparking pretty good.