Drivers side fuse box under the dash by driver door. There are 4 larger relays in the center of the box, swap the heated mirror relay with the side marker light relay to see if they come on. There is a diagram in the owners manual to identify the relay positions.
2016 Peterbil 579 Marker Lights won't work.
Discussion in 'Ask An Owner Operator' started by AgPilot1, Sep 4, 2022.
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