I took my truck to a mechanic and he said I should get a sensor box to test in the truck to see if my sensor had burned out or got messed up. I borrowed one out of my brother's truck and it didn't change anything ( I am talking about the sensor behind the radio, to the left ). I also took my brother's light switch out and tested it, just to get that offf my mind and it's not that either. What next? The ignition switch?

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99' Ford Ranger with 3.0 Standard Transmission

03' Ranger 2.3 Standard