Haven't chimed in a while guys, hope all has been well.
I installed 4 new 3 prong headlight connectors, relays and circuit breakers and 4 hi/low quad bulbs. All 4 on hi or all 4 on low in my 97 Tahoe, 93 blazer, 94 blazer and 90 k3500 regular cab dually. Surprisingly we don't get too many people...