Re: 2002 F150 Supercrew Intermittent starting issues
13.7 is a little on the low side, but still workable, also, it doesn't come in to play until after the engine is started. It's all battery on the start, and I'd say that you've ruled that out. I think what RS is referring to is a starter motor dragging either due to a dying motor or sticky bearings. Unless you have a coil pack dragging down the system (which can cause a lower output from the alternator), I'd start looking at the starter. Does the 02 have a coil for each cylinder? I can't remember when that started.
Chewing on asphalt and drinking dinosaur wine