Electrical broblem

[bghobbs]

I have a 2002 expedition with a 4.0L. This morning I was trying to test the low pressure switch on the a/c. After pulling the electrial wiring away from the fire wall to get to the switch, i found that the truck would not start. Their is no power to the lights or dash. The starter does not do anything. I did find that if I jumped across the starter relay it would start, but the starter would not disengage. So I replaced the relay, did not help. The voltage on the battery is 12.7v. Any ideas as to what could be causing the short?

 

[stamp11127]

If all you did was to move the wiring harness then I would check the connections around where you were working. Depending on how much you moved it something may have broken or loosened up.

If nothing is obvious then you'll need a test light or dvm to start troubleshooting. Also, I think there is a mega fuse in that area that may have blown.