Switch malfunction, break or short in the wire, relay malfunction.. it's possible that it could be the bulbs, but I'm a bit skeptical about all four of them going out like that. The brown wire, IIRC, is the one which supplies power to your marker lamps. Test that with a test light or DMM to see if it's getting power to it. If there isn't, start tracing the wires to find a break or short in the brown wire.
Every flower dies, no matter the thorns.
- 1997 Blazer - 4 dr. LT 4x4, aftermarket stereo, UHF2150A headlight flashers, FA6 tail/reverse light flashers, aftermarket tail light housings, LED upgrade in progress.
- 1987 V10 - Silverado, short bed 4x4, lift project in progress