Diagnostic guides
How Sebastian checks the things that most often stop a vehicle, with the real readings and video from the job.
How to check CAN bus termination resistance (60 vs 120 ohms)
With the power off, measure between CAN high and CAN low. A healthy network reads about 60 ohms. Here is what 120 ohms, much lower readings and OL mean, with a real 60 ohm check on video.
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How to find a high voltage isolation fault on an electric bus or EV
Make the system safe, test each high voltage conductor to chassis with an insulation tester, then split the circuit until isolation comes back. With video of a real isolation fault traced to a contactor.
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