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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

Cummins Insite/QSOL options
07/09/2020 in the HD/Fleet Forum
I have questions.... :) I have contacted Cummins support, and they have been quite helpful. I now have decisions to make. I'm asking for opinions from those who use it... I havn't gotten the email yet with price quotes, but that's coming. I don't know, bu...
what is this light?
07/08/2020 in the HD/Fleet Forum
[2015 Kenworth T800, ECM/Inputs/Outputs Photo] Customer sent it to me this morning. I do not have an owner's manual for this, and driver does not know where his is. I feel embarrassed to ask this, but I need to find out Thank you.
Mode 6 data
06/29/2020 in the HD/Fleet Forum
[Driveability: 08 Ford F-350 Super Duty XLT 6.4L] I had this 2008 f-series in the shop last week for a check engine light and what the customer told me the regen light came on and never went off. Code scan shows P0703 brake pressure apply switch stored b...
06 Int 4300 brake lights
06/25/2020 in the HD/Fleet Forum
[Electrical: 06 International 4300 7.6L] Our 06 4300 has brake lights stuck on. I cannot find a location for the switches. There are 2 switches up under the dash above the pedals but neither seems to be them. Where are they?
06/22/2020 in the HD/Fleet Forum
Does the control head supply power or ground to activate AC Compressor relay? on the relay side of thermostatic switch is 12 volts , the control head side is 10.9 volts both are engine off. I think the control head is bad and voltage should be zero and su...

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