Thanks for posting back. That's a lesson that people -- especially technicians --
must be aware of. It's exactly why I wrote this post:
keep-your-engine-on-the-ground-not-just ... 28130.html
Had any one of those dealer techs taken 10 seconds to voltage-drop your grounds, they would have found a normal drop to the block but a big drop to the chassis, immediately implicating the "middle" connection on the main ground cable. The design defect isn't actually the cable length, it's the fact that on a Max or Altima, it's directly underneath the battery tray and invisible from the top of the engine box. Battery fumes can corrode it endlessly with no one the wiser. The sad aspect is that it literally takes 10 seconds with a $10 voltmeter to do a definitive diagnosis and get it right. For anyone else in this situation, if you DIY in the slightest, pull that meter out of your box periodically and do it yourself. Your car may one day blow you a big kiss for it.