No power to rear blower motor in Sub?

1994 sub with rear AC and heat, checked a fuse not clearly marked and it is good there is a main wire (red) going down the rear pillar and there is no power, Is their another fuse or a link you know about or a common problem with these before tearing down the headliner?

Thanks in advance

Check by the parking brake, there is a junction panel and you may find the heavy red wire plugged into one of the cavities. The connection could be burnt.

Thanks tried that already. Does anybody know where i ca find a schematic for this?