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That was a good read and I haven't seen that one before. So to sum it up.. That blue plug (BSD) is how the IBS communicates with the DME.. The IBS gives info to the DME and the DME uses that to give the best charging voltage to the battery... If the BSD is unplugged the DME will not get that info... Then the DME goes into emergency state and charges with a straight 14.3v..
So the blue wire unplugged would still charge your battery... You said you needed a new battery but got your battery serviced, what do you mean by this? If you didn't get a new battery and needed one back then, than you probably just need a new battery.. Check you voltage if you have a meter...
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