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Automotive HD/Fleet Forum

Professional automotive forum for discussion of heavy-duty trucks, buses and other on- and off-road equipment, and maintenance of automotive fleet vehicles. Discussion topics include fuels and lubricants, hydraulics, performance, on-board diagnostics, powertrain, power distribution, anti-lock braking and stability control systems, and best practices as they relate to heavy duty and fleet maintenance. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the HVAC Forum.

Recent Automotive Discussions in the Automotive HD/Fleet Forum

1999 Fld70 Gear change questions for under power
04/22/2024 in the HD/Fleet Forum
Hello all we have this truck with a cat 3126 that is under powered and it is looking like at this time we will not be able to get a new truck to replace any time soon my first thought is to get lower gearing for in it. Has 5.29 in it and going to a 5.86 w...
5.9 Cummins Idle Validation Switch
04/19/2024 in the HD/Fleet Forum
[Driveability: 00 Ford F650 5.9L] Greetings. Now retired, I no longer have access to MD/HD service info. The above dump truck has once again worn out/broken the idle validation switch (IVS), located on/within the accelerator pedal assembly. When this hap...
PTO Shuts down
04/08/2024 in the HD/Fleet Forum
2024 Western Star Make DDE Model D471952 Series [...] I have a PTO problem…. This has a Hiab 425 boom mounted to the truck Hiab mounted the PTO and the truck came with PTO set up (electrically) Ther problem is that the PTO shuts off for about an hou...
Freightliner odd electrical events
04/07/2024 in the HD/Fleet Forum
2014 Freightliner 108SD 4x2 municipal snow plow truck [...] 52,994 miles 3076 hrs. Got some odd things going on. Beep the city horn, or switch between high and low beams the radio shuts off. I do very little with Freightliner electrical, but the customer ...
ABS Light but no codes
04/05/2024 in the HD/Fleet Forum
[Brakes: 02 International 4300 7.6L] The abs light is on. It had flash code 7-3 for the retarder circuit shorted to ground. We found that pin number 7 on the black x2 connector was shorting to ground inside the abs ecu. We replaced the abs ecu and the ab...

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