[AT] OT

[Spencer Yost]

My guess:

Some systems are more sensitive to voltage variation than others.  His entry system may require a full 12v to operate (ie 11.8 won't do).   Any resistance/connector issue(check the grounds as farmer would say) could conceivably conspire to drop the voltage to the entry receiver/computer to less than 12v.    Especially if the battery is at the end of it serviceable life where resting voltage drops are common.

Charging the battery would fix it, as he is finding.  It raises the baseline voltage.  I'll bet the problem would go away with a new battery too.

But ultimately I think it's the battery.   A truck sitting for just a few days should not have a resting, baseline voltage low enough to affect electronics.   So check the battery first, connectors and grounds next.

A good test is to measure the voltage when it happens, and again after the charge and the system works.  The numbers may surprise you.


Good luck,

Spencer

> On May 21, 2015, at 21:44, Richard Fink Sr <rfinksr at verizon.net> wrote:
> 
> Can any one on the list tell me if a 2012 ford pickup has a chip in the 
> key that would be affected by a microwave or cell phone and disable it. 
> I have a friend that has this truck and if let sit for about 2 days the 
> key fob won,t operate, but the dealer says  it is caused by key, And 
> have replaced the truck battery said reprogrammed the key and said 
> fixed. But continues, charge the battery for about 1 hour @ 10amp all 
> works ok????????????
> Thanks
> R Fink
> PA
> 
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