electical

Okay so I've got a no start condition right now in my '89 b2 with single pump, I've narrowed it down to the fuel system. It's not making enough pressure so I did a voltage drop test on everything from battery to pump. It looks good until I get to the inertia switch as in when I do the test on it...

So here goes, last week I was driving my Bronco to pick up some lumber, as one does on a Sunday afternoon. The truck started a little weak but drove to the lumber yard fine. I place my order and go out to leave....CLICK..no crank. So after an hour of messing with the truck and sweating to death...