Sure looks like a ground wire to me. I'd use a volt/ohm meter. Set it to volts first and see if it's hot (pretty sure it's not going to be hot but best to check first). Then I'd set it to ohms and see if there is continuity between that and ground. If no continuity I'd hook it up to the ground terminal on the battery. And hope your inverter starts working. I assume you checked for voltage at the dc input terminals on your inverter?
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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