The scourge of the 12volt world!! Why anyone would use those other than the fact that they are lazy is beyond me.
Please take the time to solder and heat shrink those connections properly, you should have enough wire stuffed in there to do it right.
2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio