No Crank
5th Wheeling
Joined: Apr 2012
Posts: 32
Likes: 1
From: CT & VT
ifrythings - I gotta thank you for sharing your thoughts on this no crank issue.
Out of the blue today I had a no crank issue on my 2011 Lariat w/6.2. I hadn't had it on the road in about a month and figured I've got to get it out and take her for a ride. I have a battery disconnect on a post because of a parasitic draw that I need to dive back into but that's a whole other thread.
I connected the battery, which is just a year old and it was fully charged, and the Truck didn't start, not a click or anyting. Dash lit up and dinged linked normal and all looked fine with two warnings, I think they were Traction control and Diff Lock. After reading this thread I went right for the simplest solution that I could do at that time, since I don't have a scan tool handy. I reseated that large plug above the e-break and the Truck fired right up. It just seems odd to me that a plug needs to be reseated to work but I'm glad that's all it was, at least for now.
Thank again for sharing this!!
Out of the blue today I had a no crank issue on my 2011 Lariat w/6.2. I hadn't had it on the road in about a month and figured I've got to get it out and take her for a ride. I have a battery disconnect on a post because of a parasitic draw that I need to dive back into but that's a whole other thread.
I connected the battery, which is just a year old and it was fully charged, and the Truck didn't start, not a click or anyting. Dash lit up and dinged linked normal and all looked fine with two warnings, I think they were Traction control and Diff Lock. After reading this thread I went right for the simplest solution that I could do at that time, since I don't have a scan tool handy. I reseated that large plug above the e-break and the Truck fired right up. It just seems odd to me that a plug needs to be reseated to work but I'm glad that's all it was, at least for now.
Thank again for sharing this!!
Thread Starter
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,628
From: SE Florida
My educated guess as to why it works is corrosion. I'll bet that Ford cost reduced the pins in the connector, and they are not quite corrosion resistant enough. Reseating it pushes through the corrosion and the connection is made again. It doesn't take much corrosion, these circuits are very low current, so a small amount of resistance can interfere with the performance.
4wd Low
Joined: Aug 2025
Posts: 14
Likes: 5
As an Avionics type who has worked with MIL-SPEC electrical connectors I've cleaned a lot fo contacts & reseated a lot of connectors due to tarnished pins/sockets; even gold alloy contacts experience tarnishing, which varies by humid local, coastal salt -"enhanced" humidity or arid locale. MIL-SPEC connectors generally have better-designed moisture sealing construction, but the "moths," canker worms" & "locusts" never give up. A slight bit of tarnish can build up enough resistance to confuse our modern electronics. Ever had a "normal"-looking battery clamp which turned out to have the green & white corrosion just in the contact areas of the post to clamp surfaces? They frequently look clean enough but are hiding that thin film.
Cheers to all!
DF
Cheers to all!
DF
4wd Low
Joined: Aug 2025
Posts: 14
Likes: 5
Tarnished pins
As an Avionics type who has worked with MIL-SPEC electrical connectors I've cleaned a lot fo contacts & reseated a lot of connectors due to tarnished pins/sockets; even gold alloy contacts experience tarnishing, which varies by humid local, coastal salt -"enhanced" humidity or arid locale. MIL-SPEC connectors generally have better-designed moisture sealing construction, but the "moths," canker worms" & "locusts" never give up. A slight bit of tarnish can build up enough resistance to confuse our modern electronics. Ever had a "normal"-looking battery clamp which turned out to have the green & white corrosion just in the contact areas of the post to clamp surfaces? They frequently look clean enough but are hiding that thin film.
Cheers to all!
DF
Cheers to all!
DF
4wd Low
Joined: Sep 2025
Posts: 13
Likes: 4
As an Avionics type who has worked with MIL-SPEC electrical connectors I've cleaned a lot fo contacts & reseated a lot of connectors due to tarnished pins/sockets; even gold alloy contacts experience tarnishing, which varies by humid local, coastal salt -"enhanced" humidity or arid locale. MIL-SPEC connectors generally have better-designed moisture sealing construction, but the "moths," canker worms" & "locusts" never give up. A slight bit of tarnish can build up enough resistance to confuse our modern electronics. Ever had a "normal"-looking battery clamp which turned out to have the green & white corrosion just in the contact areas of the post to clamp surfaces? They frequently look clean enough but are hiding that thin film.
Cheers to all!
DF
Cheers to all!
DF
4wd Low
Joined: Aug 2025
Posts: 14
Likes: 5
I just buy whatever is available at the friendly neighborhood parts house. There was a 3M rep sponsoring a booth at a Continuing Education seminar when I worked on offshore helicopters who got all excited about gaining a big customer account & gave me a new product they had developed which he claimed could be sprayed on live circuit boards ( I just took his word for it ). It was good cleaner with a preservative & I passed the info to my Director of Maintenance & it went to the twilight zone. There are expensive options which in most cases amount to overkill, but the immediate concern in troubleshooting is to disrupt the tarnish layer. Spraying the contacts with the cleaning product is good preventive maintenance.
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oldstroker41
1994.5 - 1997 7.3L Power Stroke Diesel
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Oct 4, 2012 06:57 PM
