The battery light came on and shortly after the engine cluster and radio went out, then on, then out. Had batteries and alternator checked, replaced passenger side battery. Alternator checked ok. Still had issue. Replaced alternator, the issue with losing the cluster and radio seems to be resolved but still have battery indicator light on. Also found a wire in passenger side fuse box that was wedged in fuse box it was arcing (assuming previous owner had something aftermarket hard wired) . I removed wire. Code I'm getting is P0620. Anything I should look for first?

08 F250 6.4
191k miles
daily driver around town