"T871M - ASSY,CBL,LED,PERC 7,R410" is the part number for H700 LED cable.
I have a repurposed Dell T310 which I am upgrading the Perc 6i adapter card to an H700 adapter card. I believe that I need a mini-SAS connector on the H700 over to the backplane mini-SAS connector. The existing battery cable connects correctly. The HDD activity LED cable (small black/red cable) connects to the motherboard port, but there is no port on the H700 that works. Is there another cable that I can get that connects to these two ports? [IMAGE] [IMAGE]      
Dell T310 HDD Activity Cable to a H700