09 FEH sit for about a year, can't jump star

Old 05-15-2019, 05:36 PM
Join Date: May 2019
Posts: 1
Default Re: 09 FEH sit for about a year, can't jump star

Originally Posted by S Keith View Post
I recently helped someone with an 09 Mariner. They let it sit for 6 months while they were elsewhere (retiree spends their summers in WI, winters in AZ). Their HV battery discharged to 250V (well below nominal - completely dead). Your HV battery is likely similarly severely discharged to the point that the HV battery can't supply the current necessary to spin the ICE without potentially damaging the battery.

Owner's manual states that the 12V should be disconnected during storage for extended periods or HV battery damage may occur.

It is my understanding that the dealer has a special Ford charger that can charge the HV battery. Unfortunately, in the case I mentioned, the dealership charged him $1000 for diagnostics and were unable to charge it. I suspect gross ineptitude on their part. They told him he needed a new battery for $4000 (64K miles, still under warranty - denied).

I charged the 12V, disassembled the HV battery, charged it, and he was good to go. I also installed a harness and provided a power supply that will allow him to charge it externally if needed.

Get the 12V replaced yourself. KNOW that it's in good shape. Call around and get hold of a dealer that KNOWS the FEH. Too many don't have any experience with it.
Hi S Kieth,
You say that you installed a harness and provided a power supply to allow this gentleman to, in the future, charge his HV Battery externally if needed. Would you be willing to help me with instructions on how to do the same? I have almost the exact same situation as you described for the gentleman above, and I'm just trying to get my car back running.
Old 05-15-2019, 06:18 PM
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Join Date: Sep 2014
Location: Mesa, AZ
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Default Re: 09 FEH sit for about a year, can't jump star

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