Faulty relays do blow fuses!
I recently installed KC SlimLite 124s on my Wrangler and kept blowing switch fuses. After troubleshooting with a multimeter back to the relay I determined it to be faulty. KC sent me a better put together relay under warranty and my lights work now!
2012 Wrangler Sport 2 Door
3.6L, 6 Spd Manual, 3.73 gears, ACE Rock Rails, Maximus-3 Bumper Bar, KC HiLiTES 124 SlimLites, AEV 2" spacer lift, Duratrac 285/70R17s, 17x9 XD Addicts, AEV ProCal, 35% window tint, AntennaX.