I’m not certain, but I think that the second negative cable, on the right hand side is going back towards the trailer somewhere. Not sure about that though. The smaller guage red wire attached directly to the positive battery seems to be powering the inverter inside the cab. Also, you are right, all of the negative ground connection to the frame were severly corroded, but we have since fixed that. It looks like he might have driven it through some sort of extra heavy duty road salt, and didn’t rinse it off afterwards. Thinking to put white lithium grease on some of these connections in order to prevent future corrosion issues.
The Freightliner dealership probably isn’t going to be able to help us with a schematic until after the holidays, so I was wondering if anyone might happen to have a clearer photograph showing how the batteries are connected inside the box? Or maybe a picure of a schematic from a manual? If not, it can wait until after the dealership people get back from the holidays.
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