93 W900 master circuit breaker

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by bigguns, Oct 26, 2020.

  1. bigguns

    bigguns Road Train Member

    2,634
    6,294
    Jun 13, 2013
    Omega,GA
    0
    Can anyone tell me where to find a master breaker on a 93 W 9? Batteries are hooked and no juice anywhere. Tia. I’ll go back looking some more.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. BoxCarKidd

    BoxCarKidd Road Train Member

    2,994
    3,920
    Aug 26, 2014
    0
    There is an 89 T800 around here with a breaker hid inside the frame rail just in front of the battery box which is behind the left fuel tank. All the newer ones I remember have two or three in front of the battery box under the left step.
     
    spsauerland and bigguns Thank this.
  4. LameMule

    LameMule Light Load Member

    217
    1,139
    Jan 19, 2020
    Montana
    0
    How many volts are the batteries at?
    Just thought I'd ask the most simple thing first.
    Grab a flashlight and follow the cables.
     
  5. bigguns

    bigguns Road Train Member

    2,634
    6,294
    Jun 13, 2013
    Omega,GA
    0
    There are 2 circuit breakers in the battery box. Both have juice on both sides.
    12.8 volts at the batteries. I arced something not even realizing it I believe.
    I think I will finally be able to solve the stating issue I have been fooling with for several months.

    Here is another weird electrical issue. I have a Leon tune in the ecm. The truck has only been running in a mediocre fashion. A very recent injector issue resulting in 6 reman Bosch injectors. Lenny in the FB 60 series support is the MAN to go for injectors. On 2 separate occasions the engine has turned on the way a sled pulling truck would. It will bury the boost gauge in the blink of an eye on the first 3-4 shifts and then go back to running mediocre. An electrical issue that would tie in with my other problems?
     
  6. BoxCarKidd

    BoxCarKidd Road Train Member

    2,994
    3,920
    Aug 26, 2014
    0
    I do not remember what all it feeds but want to say your truck has a power cable in front of the LH firewall. It is a 90 degree deal with a rather large wire in the panel with a lot of smaller wires. Saw a problem with one of those once.
     
  7. bigguns

    bigguns Road Train Member

    2,634
    6,294
    Jun 13, 2013
    Omega,GA
    0
    I pulled it off and there isn't any power to it. It was dark, late and I was teed off so I went home. I'm going back shortly and have it. Hopefully day light will help.

    AAha moment maybe. The entire electrical system grounds through the starter. I'll try a jumper around the starter to the frame .
     
  8. bigguns

    bigguns Road Train Member

    2,634
    6,294
    Jun 13, 2013
    Omega,GA
    0
    Put on an old starter and I’m up and running. Going to load test some cables and wires and check out the solenoid in the battery box.

    On the starter I removed the bronze bushing was worn out and floating on the shaft.
     
    spsauerland and BoxCarKidd Thank this.
  9. bigguns

    bigguns Road Train Member

    2,634
    6,294
    Jun 13, 2013
    Omega,GA
    0
    I think my long running starter issue has been resolved. I went ahead and replaced the solenoid in the battery box. It was the original. While doing that I found a wire loose on a circuit breaker. The post was stripped and I couldn’t tighten down the wire end. So I put a nut one size bigger on the post on retightened the nut.
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted