You can get a remanufactured Denso (OE) for that car: it's probably the most cost-effective option.
The high rev voltage must be over 14 volts, so if not, then its the alternator. But make sure all connections clean and greased.
Eurovan exhibited similar behavior. Start and run fine until.... engine would lose power. Pull over and would die. Restart would be nothing. Sit for an hour or so and could restart and could get the few miles to home. Next day things could be normal or a repeat of slow down and die. This went on for a couple of weeks. The last fail found the battery to be toast even though only a year old. OK, so new battery. All good for the next few days then the gremlins return. New battery is now no good. Determined the alternator had developed enough play that when warm would start to short creating more heat and more of a short allowing it to eat the battery. New alternator and another new battery and all is and has been good.
I would get a better alternator. Denso (reman or new is fine) seems to be the only one that can take the high electrical demand of the Odyssey.
Denso alternators are the best. Denso makes great products. I do a lot of side work on Hondas and I am so thankful Denso offers their stuff outside of the dealership. I replace alternators, a/c compressors, oxygen sensors, etc all the time and I choose Denso bc it's basically the same exact part you receive in a Honda box but for half the price.
At 48K miles I experienced an alternator fail (car was running great at the time).
If the alternator is OEM, replace it, because is close to the exhaust manifold, it will fail sooner than later.
check the charging at the battery while the car is running about 2000 or 2200 rpm with multimeter. The alternator should be charging at 14 volts (give or take a little)
When I had mine I had to replace the alternator just outside of warranty.
the car is a 1996 golf gl, 5 speed, with A/C (this is relevant to the alternator spec) Original problem, car not charging and replacement alternators were no good
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