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Is it posibble to jump start a 2008 FEH with dead HV battery from a good 2008 FEH?

Is it posibble to jump start a 2008 FEH with dead HV battery from a good 2008 FEH?

  #1  
Old 05-13-2017, 09:15 PM
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Default Is it posibble to jump start a 2008 FEH with dead HV battery from a good 2008 FEH?

One 2008 FEH has dead HV battery. The 12V Jump start doesn't work.
Is it possible to connect the HV batteris then start the engine? If yes, where to locate the + and - terminals of the HV batteries?
Thanks!
 
  #2  
Old 05-13-2017, 11:49 PM
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Default Re: Is it posibble to jump start a 2008 FEH with dead HV battery from a good 2008 FEH

Originally Posted by accent2010 View Post
One 2008 FEH has dead HV battery. The 12V Jump start doesn't work.
Is it possible to connect the HV batteris then start the engine? If yes, where to locate the + and - terminals of the HV batteries?
Thanks!
Not realistically. It requires pulling the cover, and that essentially requires removing both batteries.
 
  #3  
Old 05-14-2017, 08:05 AM
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Default Re: Is it posibble to jump start a 2008 FEH with dead HV battery from a good 2008 FEH

An FEH can be jump started with jumper cables if the 12V battery isn't completely dead like a normal vehicle. Once jump-started, the generator slowly charges the HV battery. If a regular jump start doesn't work, it probably isn't a DIY fix and needs to go to someone with a Ford computer/scanner to figure out what is wrong.
 
  #4  
Old 05-14-2017, 09:30 AM
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Default Re: Is it posibble to jump start a 2008 FEH with dead HV battery from a good 2008 FEH

Originally Posted by D-mac View Post
An FEH can be jump started with jumper cables if the 12V battery isn't completely dead like a normal vehicle. Once jump-started, the generator slowly charges the HV battery. If a regular jump start doesn't work, it probably isn't a DIY fix and needs to go to someone with a Ford computer/scanner to figure out what is wrong.
That is not correct, or it is at least misleading. Here's a clarification:

If an FEH 12V is dead and the HV battery is not dead, it can be jump started.

Regardless of 12V condition (crap or perfect), it is generally not possible to jump start an FEH with a dead HV battery per the poster's request. There are 3 exceptions:

1) for 2007 and older that have the HV jump start system installed.
2) for 2008 and newer - dealer can get a special ford charger that charges the HV battery - requires tow to dealer and may be EXTREMELY expensive with NO resolution.
3) for 2008 and newer - remove, partially disassemble and charge the HV battery with an electrophoresis power supply or high voltage LED power supply.

I have personally done #3, so I feel qualified to comment.

Steve
 
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