Seeking help figuring out j box configuration.
So I bought an old grid tie system that is composed of 66 Seimens SP75 panels and a Trace SW 5548 inverter with large capacitors insted of batteries. This system will be broken down to individual panels and sold piece by piece. As I'm breaking down the tri-lam , 3 panel modules and getting into the junction boxes I find these panels have been set up in the 6 volt configuratuon. These panels could be wired as 6 or 12 volt nominal. In the junction box there is some sort of electrical component on one of the two + output terminals, bottom left, connecting to one of the two - negative terminals. I have removed it and it can be seen in the top photo of the J box connections. Not sure what it is but maybe a blocking diode.
So my dilema is I cant figure out how to get 12 volt nominal voltage from these panels. I have handled hundreds of these panels in the past and haven't had any issue configuring them for 12 volt output. In the bottom photo I have already set the jumpers for 12 volt. The factory configuration would have bypass diodes on the right and left where I have a solid wire jumper. I can't see the fact that I have solid wire in place of diodes would prevent the panels from making voltage but wired as the lower photo I'm getting 0 volts even from the Buss tabbing coming in from the cells. It's a mystery.
Has anybody out there ever seen this Jbox configuration and can possidly point me in the right direction?.
2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 540 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.