379 blowing speedo rpm fuse at 55mph?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by CruzControhl2, Jan 15, 2025.

  1. CruzControhl2

    CruzControhl2 Light Load Member

    101
    73
    Sep 24, 2023
    North America
    0
    This is weird. My 379 is blowing the fuse for the speedometer and rpms but only once it gets to about 50, 55mph. I plan to dig deeper but when I have time. Maybe someone has a schematic for this circuit. I figure the gauges go to the fuse box and from fuse box to sensors? One side of the fuse has power once it's blown so there's that. Not sure how the battery sits in the equation to power that circuit. Any help appreciated.
     
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