O.K. so i haven't been very active on the org. in a few years but I know it used to get flooded with no starts when the weather turned. A lot of them got referred to the search bar and I tried searching but couldn't find what I need. Can anyone help me by linking a thread or giving some advice? Here is the deal.
2002 F-350 dually 4x4 ext cab lightly modded. It has the Napa6637 air filter mod, a 4" exhaust from turbo and international bellowed up pipes. Running a Superchips super tuner 1607 (I think thats what its called) on the tow safe tune constantly. The trans was rebuilt 2 years ago with all billet or HD parts and a transgo tugger kit. I basically told my local trans guy a BTS trans build and he already knew what i wanted.
Last winter it would get hard to start if it was really cold during the day or if i didn't plug it in then forget about it. chug chug chug typical &.3 that probably didn't have all or many glow plugs working. Towards the end of winter it sat at work outside one day when it was well below zero and that was the last straw for the starter. New starter (under warrantee) and an hour o
plugged in and all was good. In the spring it started running on 4 cylinders and I knew instantly it was probably the wiring in the valve cover gaskets but didn't have the time to fix it myself so off to the dealership. They confirmed the wiring problem and said the glow plug connections especially were burned bad. all was good and I did notice the truck started much easier this fall when the temp began to drop. But I was still running the old batteries(I didn't pull the date stickers off so iI don't even know when I bought em
) which I had run down to co crank a few(lot of) times.
So, this winter all was fine it seemed to start better overall but at around 30 degrees I had to plug it in. Then about a week before it failed we had a really cold day -10 with windchill I think and sitting all day it didn't want to start. It was real close and I had to pick my kids up from school so I just kept trying. the voltage got so low it quit cranking but I kinda jiggled the key and got one more crank which was enough to get it to go.
A week later (truck got used almost everyday between) I go to start it and it cranks about twice real strong ,no chug not lugging and just quits cranking like it was shut off. Everything lights up fine but it just won't crank.cant hear the starter even trying to engage but I can hear the relays by the fusses clicking. Starter is under warrantee so I put a new one in, no change. I figure the batteries are old I know I've stressed them more than I should and new batteries in a 7.3 are usually not a bad idea. 2 new napa65 series and still no change.
My research brings up a neutral safety switch as a possible issue but if that was it wouldn't the relays be silent? Im at a loss and don't really want to pay a mechanic right now. Can anyone point me in the right direction?