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Updated: Aug 16, 2020
First let me say that Automatic Traction Control (ATC) was never meant to replace locking axles. ATC is great for counteracting wheel slip on paved surfaces, but if you go off-road then Diff Lock (cross-locked axles) may be required to keep you from getting stuck, or to pull yourself out of slippery terrain. At times you will see both of these products used on the same vehicle, especially today on tractors.
Updated: Aug 16, 2020
The amount of weight allowed with steerable lift axles can be found in a document referred to as “Extra Legal Weight, Charts “Orange, Green or Purple”. https://dot.ca.gov/programs/traffic-operations/transportation-permits/weight
This ABS Trailer fault light in the dash has been a requirement on all tractors since 2001. The indicator lamp is used to alert the operator of an ABS fault. The signal is a PLC (Power Line Carrier/Communication).
