Battery woes - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 07-31-2006, 09:40 AM Thread Starter
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Exclamation Battery woes

I have had my truck for about 8 months now and love it but for one problem. I have had times it just would not start . The first time is when I found this forum and got insight to causes. It would crank with no start. As you may have seen here, that often means a crank sensor needs replaced. This I did, along with the glow plug controller. That seemed to fix it for a while though every now and then it would not start. I found that if I gave it a jump, it started right up (the computer needs 10.5 volts while cranking ). This put me on the track of checking the batteries only to find that this is not as easy as going to the auto parts store and putting it on the tester. Nor did the dealer find any issues with them. I tested cell to cell looking for a weak one as I was told that is a common cause for this. As summer came around here and the AC is used often, the problem came back again. If I turned off the AC before trying to start it would start but not with it on. I used my meter to verify that I was dropping below the 10.5 volts. I pulled one positive at a time and tested the voltage finding that one battery was just a little lower than the other. So I decided to bite the bullet and by 2 new batteries even though mine kept testing OK ($200). When I got ready to replace them, I put the wrench on one of the bolts only to find the very tight but that the lug to the battery post was not. Seems that there was a layer of corrosion under the negative lug preventing full current flow. I cleaned all the posts and lugs and reassembled it using dielectric grease on all contact points. I returned the new batteries and it starts every time now!

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post #2 of 2 Old 07-31-2006, 06:11 PM
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Glad to hear you got it fixed.....

Corrosion like that is very common in trucks more than about three years old, especially if there has been any draws or if the starter or altenatoir has ever gone bad. I clean the battery terminals (take them off and clean them) in all my vehicles about every six months just because i have seen what a pain a little resistance in a cable end can cause..
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