Shayne
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Found this interesting in the comments. linkProfessor John D. Kelly at WSU
See the contactors of a 2021 Ford Mustang Mach E GT high voltage battery. See the removal procedure and a functional demonstration of the contactors.
This is a great video from WeberAuto -
"SMTSHREK
Great video professor! A lot of quality in depth information, even for a ford master tech like me who has hands on experience with Mach-e’s for the last couple months.gotta say you break it down way more and better than fords web base training and the hv battery repair class, thank you! I’ve replaced a handful of HVBJBs already mostly all in GTs or standard and with extended range battery, and I’ve been dying to open one up to see how they tick like you just did but ford has been calling them back almost as fast as I take them out. Thank you for showing the insides.
A few things I’d like to share…..
The recall is a module programming that will modify contactor performance and ford is hoping will save the hvbjb from having to be replaced. But software will not 100% fix hardware and some contractors are still failing, so much ford released a tsb this week to replaced hvbjb.
That leads to my next tid bit of Info, you mentioned electrify America maxes out at 350A which is under the dc fast charge rating of the Mach e, but the dc contactors can’t handle that even though it’s working it’s rating. All the failures I’m seeing are welded positive dc charge contactors after charging at an electrify America station…..
Finally i hope I didn’t miss you mentioning it, but it should be mentioned that both contactors may fail closed and set dtcs for both contactors.battery will not be denergized and is not safe to open. No choice but to replace the $26,000 battery. Now with current failures of the dc charge contactors both may stick without setting the dtcs needed by ford to replace the battery. I’ve worked with engineering to get at least one unstuck and so far it’s worked. So hopefully ford is working on a fix for that.
Keep up the good work, looking forward to more videos!
WeberAuto
Thanks for the kind words and the great information. Stuck shut contactors is no more dangerous than working inside the battery. Just unplug the battery positive and negative cables from modules to the junction block and the power will be removed from the junction block. I understand why Ford would take thin stance, but unless I am misunderstanding something, it is not a big deal. Personally, I cannot see how stuck shut contactors would damage anything else inside the battery."
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