Battery light blinks intermittently?

Thank you for your prompt reply and forgive me for my slow one. The vehicle belongs to my son who live 14 miles away and has been very busy.

We finally got around to working on the vehicle. We replaced the electronic load detector with a new OEM Honda detector. It changed nothing.

Here is what we have right now. With no lights nor blower motor, there are no blinks. With lights and no blower motor, there are no blinks. With lights and blower motor at max speed in the heating mode, there are no blinks. With lights and blower motor at max speed in the A/C mode, we get a single blink of the battery light about every 30 seconds. With no lights and blower motor on max speed in the A/C mode we also get the single blink about every 30 seconds.

From the results above, it would seem that the blinks are somehow related to the a/c system operation. However, it did not blink before the alternator failed. Also, the only difference in electrical load between heating and a/c modes is the compressor clutch coil is energized.

The new alternator is a top of the line after market replacement purchased from O'reilly's where my son is the store manager. It has a lifetime warranty so we could change it out if we feel it could be the cause. The alternator keeps the battery fully charged and puts out 14.4v at idle. Vehicle runs exceptionally well, just that nuisance blink under certain conditions.

Please provide your thoughts on this. Thanks in advance for your reply!

Thank you for your response.
We are still working on the problem as time permits. As I stated earlier, the vehicle runs flawlessly, and the battery stays fully charged so my son is continuing to drive it on a somewhat regular basis. One thing you might have misunderstood is the battery light only blinks once about every 25 seconds did not blink for 25 seconds, only one short blink. And it does not do it all the time. One might drive it for a 2-hour trip one way, and it never blinked but on the return trip it starts the single blink every 25 second. Last week we were testing it and it started having one single blink every time we turned off the HVAC blower motor. Just a few minutes later we could not get it blink at all turning off the blower. Then it started its "regular" blink cycle. Thinking it might be related to the HVAC system, we unplugged the condensing fan motor, but it made no change. The problem seems to be intermittent. One other observation, my son says if you are driving at night with lights on and it blinks, you can see a momentary slight dimming of the lights. So, the ELD is not lying.

So far, we have replaced the electronic load detector (ELD) with no change. Next, we replaced the alternator with another new alternator (14.4V output) with no change. We load tested the new battery and it tests good. My son says he cleaned the battery terminals and block ground however sometimes his idea of cleaning is not the same as mine. Since it now appears to be somewhat intermittent maybe we have a grounding issue.

Could please you get me a diagram of the grounds locations both body and engine for this vehicle We will then go through each and insure they are clean and bright.

Thank you in advance for your reply and thank you again for your help in the past.