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The resistors get wired from the hot to the ground, so one of the wires going to socket will have a wire from each resistor.Sylvania equalizers won't do the job if I install on the running light wire
Your not the first to experience this phenomenon. There's been multiple reports across many different model year trucks that have had either resistors or AlfaOBD not work, even using both not work or stop working years later.All other lights on my truck responded to Alfa OBD the way you mentioned.