Compression Ignition Addict
Join Date: Sep 2012
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Another no start after hg/stud job
Well, I'm at a dead end on this truck. It had two newish motorcraft batteries, so I started my 7.3 F250, removed it's newish Super Start batteries, and put in the motorcraft batteries to charge with the truck idling. The motorcraft batteries were weak when I removed them from the 6.0 during the stud job.
I then put the two Super Start batteries from my 7.3 into the 6.0, and it sounded normal trying to crank, speed seemed normal and cadence sounded right. It actually seemed like it wanted to fire. Once I drained those batteries, I swapped the motorcraft batteries back in, and put the Super Start batteries back in the 7.3. The 6.0 would just slow crank. I hooked up jumper cables from the 7.3 to the 6.0, still just slow cranks. I let it sit for about 20 minutes with the 7.3 idling, and still just slow cranks. I turned the 7.3 off and started it to verify the Super Start batteries had enough juice to fire it, they did just fine. So I put them back in the 6.0, and it would still only slow crank.
Just for kicks, I put the Motorcraft batteries in the 7.3 (the 6.0 was slow cranking on them) and the 7.3 fired right up. Granted, it was at 190* operating temp from idling so long.
I hooked up my el cheapo Harbor Freight $20 battery charger just to see what the meter would read, and it showed both batteries in the 6.0 at 40% charge. It would jump up to 100% charge if I connected the jumper cables to the idling 7.3, but still only slow crank.
I'm not sure if something is internally wrong with the 6.0, or did I forget a ground wire.. or possibly kill the starter?
2006 F250 6.0 XLT FX4 CCSB
MBRP 4" straight pipe with 5" tip
Studded and deleted
Atlas 40 and Looney Tuned
2002 F250 7.3 XL Reg Cab 2wd Sold!
1995 Ram 3500 Dually Reg cab 5.9 12v auto 2wd