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c/diesel-mechanics•evan_green52evan_green52•13d ago

That 12-hour diagnostic on a junker Freightliner that should have taken 2

I spent last Thursday chasing a phantom electrical problem on a 2005 Freightliner Columbia that was intermittently killing the dash cluster. Customer said it would just cut out after driving an hour, then come back after sitting. I went through every ground, checked the ignition switch, even pulled the VECU connector twice. Nada. Finally after about 12 hours of swapping parts and staring at schematics, I noticed the CEN fuse holder had a hairline crack that only opened up when the engine bay got hot enough. That thing cost me a full day's labor because I trusted the fuse looked fine when cold. Anyone else lost a shift to something dumb like a hidden fuse crack that laughed at your multimeter?
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3 Comments
ray_martinez82
Ha, nothing worse than a part that plays hide and seek with your meter.
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bennett.evan
@ray_martinez82 bet your meter was laughing right along with that fuse.
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diana512
diana51212d ago
What about checking voltage drop across that holder while hot?
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