2015 Prostar has stability and handling issues when hooked to a trailer

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Packer1077, May 12, 2020.

  1. BoxCarKidd

    BoxCarKidd Road Train Member

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    What is your front axle weight when loaded?
     
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  3. Packer1077

    Packer1077 Bobtail Member

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    Front axle weight is between 11,100 to 12,000. I broker my own loads and try not to get above 38K right now.
     
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  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    OK just wondered if you were running light up front.
     
  5. Packer1077

    Packer1077 Bobtail Member

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    Ok, the front radar appears to be correct when looking at it the plug is on LHS of unit. No damage. The truck was better but just wobbled a few times. Nothing like the unstable that it was...could have just been the road and me not remembering how it should feel since this all started in late February. I checked all the fuses and swapped out some of the relays. Not sure how to test if they are ok or not. (With meter). Checked mega fuses on firewall and sleeper area. Mega fuses lite up when touched. Also checked the red wiring going to them and were fine. Didn’t get to battery, will do that tomorrow. Is there just one 30amp fuse on battery?
     
  6. Packer1077

    Packer1077 Bobtail Member

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    When I pulled the 2 30amp fuses.
     
  7. Heavyd

    Heavyd Road Train Member

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    Behind the panel in front of your passenger seat is the breaker panel. Remove the cover and the back of the panel is a diagram and layout of all the relays and breakers. You should have 2 30 amp green breakers in there somewhere for the ABS.
     
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  8. Packer1077

    Packer1077 Bobtail Member

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    Ok will check those as well. Battery 30 amp was ok. Today I’m on I’m slanted part of interstate and it feels like the passenger side steer is being slowed down. (Right slant)!could this be sensor and would it knock out steering and yaw calibration? I have recalibrated both 12 times since May 14th
     
  9. Heavyd

    Heavyd Road Train Member

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    It's probably the roads and your tires. Any vehicle will follow the slants and the ruts in the roads.
     
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  10. Packer1077

    Packer1077 Bobtail Member

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    No that’s when the steering and yaw will go out after approximately 1,000 miles. Okay have the kick panel off, can you tell me where the fuses are please. Pic you have one. Will have to work on it later. Thanks.
     
  11. Heavyd

    Heavyd Road Train Member

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    One the back of the panel you pull off, there should be a sticker with a fuse diagram that looks like this;

    See in the list how it shows F8-B and F8-D are for ABS, these are your abs fuses. Does your breaker layout look like this?
    Prostar fuse panel.jpg
     
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