you dont even need ISTA to figure out the alternator is dead. A fresh and charged batter will sit at 13v, used should always be around 12v. while charging it should be 13v. the fact this is dropping while the car is running suggests a shot alternator right off the bat
Generally, it's best to go with new OEM (Honda) parts. My second choice is aftermarket, new or rebuilt parts. That said, in all my years at wrenching I've had great luck with aftermarket from reputable (NAPA, Duralast, etc) stores with good warranties.
Honda uses great parts. They're expensive though. I had to buy the OEM alternator for my CRV from the dealer (because that was the only one I could get in one day) and it was 700 bucks
I had a Honda Odyssey do this for years. Finally took to Battery Plus. They checked my battery at the time (which was not having issues…yet) which they said was good. On a lark i asked if their device could tell if the alternator was okay. He said yes, did something on the meter, and then showed me on the screen the alternator showed “errors”. I had the alternator replaced and the dead batteries stopped happening.
In my experience, it’s most likely the alternator, I’ve replaced so many I’ve lost count.
My local mechanic put a new alternator in my older Accord late last year. It was around $550, including a new serpentine belt.
Sometimes when u replace the alternator but the battery is bad it'll just fry your new alternator.
I have a 19 Accord. The alternator is buried under the intake manifold. It has to come off. That means draining the cooling system.
My car 2012 honda pilot died while I was driving down the highway yesterday. The stereo cut power on and off, then I lost power to the vehicle and I pulled off the road. I got the vehicle towed to a garage assuming the alternator crapped out (120k miles on my SUV).
I think it may be the alternator to be honest because I’ve had one headlight burn out trunk latch inside the car stopped working but the key fob works window button not work properly in one instance, so-called battery wasn’t good when I just had it replaced less than six months ago. Recently they told me that it was my battery this whole time and within two weeks the lights were back on my dashboard.
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