I would be especially concerned about that solder bridge, which could be causing a short. As for your voltage readings they are very much on the low side. I have a Scanguage attached to my vehicle, and when first started, with the lights on, rear defroster, and front defroster activated, and the afterglow process engaged, my voltage measures 11.8 at idle. With the afterglow process completed, my voltage jumps to 13.2 at idle, and 13.5-13.7 at about 40 mph. Good luck with your problem.

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96 E300d