blackop555 Posted February 4, 2012 Share Posted February 4, 2012 im working on a 6.4l f350. every once and a while when goign to start it the dash lights just shuts off and truck does nothing. found when this happens fuse 27 blows. maybe does it out of 100 starts then it will keep doing it for about maybe 20 key cycles off to start and sometimes if you just let it sit a bit it will work fine. sometimes the fuse wont blow and the starter will just not turn untill you let it sit a bit. the no starter response started before the fuse blowing. when it wont start turn key to on and jump starter wire under hood fires right up. same as when fuse is blowing. putting in a new fuse and then turning key on and jumping starter it will not pop. i have removed the bjb and checked all the related wiring from under dash to the front grill and have found nothing. any suggestions on what to check? Quote Link to comment Share on other sites More sharing options...
cbriggs Posted February 4, 2012 Share Posted February 4, 2012 I have seen numerous electrical shorts caused by the harness chaffing on the edges of the core support, near the front inside corners of the fender liners. Can usually see in there, but need to pull the fender liner to repair. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted February 4, 2012 Share Posted February 4, 2012 Like this: Quote Link to comment Share on other sites More sharing options...
blackop555 Posted February 5, 2012 Author Share Posted February 5, 2012 That's a big help. Noticed when pulling down there the test light will light indicating ground. All thanks to your help. Only problem now is Ford shows the wire that I find sorted is a.blue/white wire. One I find is a white/violet. Do you know of a wiring labeling issue for this? Quote Link to comment Share on other sites More sharing options...
ablokzyl Posted February 5, 2012 Share Posted February 5, 2012 I have never seen a chafe there.......but now that I see it I will sure as hell be looking there!......great pictures thanks! Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted February 5, 2012 Share Posted February 5, 2012 Like Chris said, it can happen on both sides of the core support. I usually just remove the 2 front fender liner bolts and pull back the front of the left and right fender liners to have a look see at the harnesses. It's like a mirror image on the other side of the truck. Quote Link to comment Share on other sites More sharing options...
DieselD Posted February 6, 2012 Share Posted February 6, 2012 I had one of those core support chafes early on 6.4 days kick my ass for 2 days!! That was a sigh of relief when I found it Quote Link to comment Share on other sites More sharing options...
blackop555 Posted February 7, 2012 Author Share Posted February 7, 2012 Found the wire. Couldn't see any rub marks on the outer loom mesh. Soon as u cut it open I saw it. Quote Link to comment Share on other sites More sharing options...
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