62-1863 Armor Question in C-130 Technical Posted December 20, 2010 For Money, Kingchief. It isn't APN59 stuff, if it was, I would know. There's usually a test equip receptacle right next to the -59 R/T unit. The connector has two large pins and 5 smaller ones, almost like it provides power to something. That's just a guess. Sounds like test equipment power. But like you said, that was usually lower down. If we still had 1832 or 1836, we could compare/contrast--but they're in the boneyard. Maybe someone could go look at 1857?