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Hi. Technically you should be able to remove that red cable (with due care and attention - all battery grounds disconnected and taped; no SP; no gen) from between the chassis battery post and the chassis switched post on the BCC, as long as your chassis disconnect latching relay is working properly. Then, in order to power many of the electrical loads still connected to the chassis battery, through the chassis disconnect latching relay, you would have to operate the “chassis disconnect” switch located near the entrance to your coach.
The Thor recall, by moving the original chassis switched cable over to the chassis battery post, basically hard connected many of the critical Ford chassis loads to the chassis battery. This was done because if the chassis disconnect latching relay inside the BCC failed open at any time, (eg., the engine could die going down the road at night, with loss of lights and other critical systems). I am assuming a previous owner, or whoever did this recall also added the red wire, I assume, to make sure that if the chassis disconnect latch relay ever failed after the recall, the other electrical loads still connected to the switched side of the latching relay would remain powered.
I am not sure why you mention a “second recall”, as I thought there was only the one recall, unless I missed something. I know some folks just left the original factory cables attached to the BCC terminals and then jumpered across (like your red wire) with a large gauge battery cable. Technically it satisfies the recall, but also makes the “chassis disconnect” switch at your entrance door useless. Makes disconnecting the chassis battery from its remaining switched loads more difficult, if you want to do that.
Regarding your described trouble though, if you look in the top left corner of the schematic I attached previously, the top two terminals down the left side are where the chassis battery (top) and the coach battery (next one down) attach to the BCC. You will note that there is an open relay contact shown between those two connection points inside the BCC on the schematic. That is the “interconnect relay”, which under certain conditions closes to connect the chassis and coach batteries together for joint charging and for emergency starting. So it also closes when the driver operates the emergency start switch (if everything is working OK). I suspect that silver relay (interconnect relay on the schematic) in my previous pictures, is your problem, or related wiring/connection that normally operate that relay. I don’t think the red wire is responsible for this trouble. If you do not have electrical experience though, I would caution you not to go into the BCC with any battery grounds connected and even be very careful working on the exterior of the BCC. Serious electrical problems could result if you are not careful here. If you find you have to replace the interconnect relay, I would leave that to someone with the electrical experience to do so. I think Thor would just replace the whole BCC through a Dealer for big bucks; you probably can buy parts on line from the manufacturer or Amazon, but need the electrical safety knowledge to replace it. Look for the documents and video on line that I suggested in my first post and through testing procedures, you may find your problem is just a loose interconnect relay control connection somewhere.
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