I have read some of the post but wanted to see if i could get some help????
I have a 6.0 2005 fx4 turbo crew cab. A while back my battery light started flashing on and off. It would only do it about once every two weeks. I put two brand new optima batteries in and the alt is good. Today i went to leave work and it wouldnt start, just kept turning over and turning over. I cycled the glow plugs a couple time (80deg outside) and tried a few more times and same thing. lifted the hood and felt the fuel pump under the truck, it was working. then tried again and after turing for a long time it started. This also happened one other time. What do you think could do this??