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I attached a wire diagram for you to review. there is an eld in the fuse box which is an electronic load detector. it sense load applied and sends a signal to the pcm to turn on the voltage regulator. this needs to be checked to verify either the eld is bad or the pcm.
as the diagram says, under dash fuse box.
you need a voltmeter and a test light.
you check the eld by removing the plug under it in the fuse block under hood. one wire will have 12 volts and the other two should have 4.5 volts key on. put the voltmeter between those terminals.
the pcm you would need a scan tool to activate the regulator
black orange 12 volts
voltmeter between the other 2 is 4.5 volts. that check is done with the eld hooked up under the fuse box with key on
the voltage is low. I would replace the eld and re test the charging system. you cn get it at honda for about 25 bucks. I have not seen any aftermarket parts store carry these.
it is the electronic load detector. it is on the other side of the connector you checked. it is held in by 2 screws. yes, if it is bad. no signal to the pcm to turn on the voltage regulator in the alternator to start charging.