Power to ecm

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Canary379, Feb 23, 2020.

  1. Canary379

    Canary379 Light Load Member

    52
    2
    Apr 13, 2012
    Illinois
    0
    I have a Cat c15 and no power to pins 52 and 53. Pin 70 shows power when key is on and the grounds are all good. For whatever reason the truck started fine until one morning the batteries were drained and i replaced all 4 of them. Now the truck just cranks and that’s it. Is there a fuse that I should check on the fuse panel. The fuse in the battery box for the ecm hot wire is good and it reads 12v on both ends as I probe it.
    I am thinking I need to run a new hot wire to the ecm but am not sure if I run it directly from the battery or if it needs to be run from the fuse panel?
    Thank you
     
  2. pushbroom

    pushbroom Road Train Member

    1,406
    5,754
    Sep 1, 2012
    0
    Constant power comes from the fuse in the batt box them follows the starter cables, goes in between the starter and the block and then to the ecm. There should be a 2 pin deutsh connector above the starter. They like to rub out and corrode on the straps that hold the batt cables.
     
    stuckinthemud and spsauerland Thank this.
  3. Canary379

    Canary379 Light Load Member

    52
    2
    Apr 13, 2012
    Illinois
    0
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