RAM 2500 Van V6-239 3.9L Magnum (1995)
License Plate Lamp: Description and Operation
Tail Lamps and Rear License Plate Lamp Ground Circuit
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Circuit Z1 provides a ground for the parking lamps, tail lamps, and side marker lamps. The license plate lamp is case grounded.
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Circuit Z1 also splices to the trailer tow harness.