Ok, quick question. My NTU 2014 F150 Max Tow package truck seems to not have the 12V trailer battery charge relay and fuse installed. I don't think the PO towed with it. If I put the relay in the empty #9 spot, and a 30A fuse in #21, I should get power, yes? And what in the heck is the generic name of those fuse cartridges? PAL? JCASE? Man, I'm getting old... fuses used to be little glass tubes, and then a single spade type, now we have dozens of non compatible configurations. Anyway... Thanks!