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Any expertise here on the Honda Dual-Mode Charging System?

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nali:
Just doing a bit of searching this does seem to be a US thing. Apparently there is a charging mode input to the alternator and disconnecting it forces the alternator into "conventional" mode.

Here's a link where you'll find wiring diagrams should you want to go poking around in the engine bay https://drive.google.com/drive/folders/1oB5uVTd8aZKrcxAtC7S3L3zIgehH_sh2

Peabody:
Yes, I'm afraid I have the LX model, not the EX, so I have to control the headlghts manually.  I can't just leave the switch on.  Driving in daytime with headlights on is not something seen often in the US.  But almost all cars now have DRL.

I would even accept the low voltage mode being something like 13.2V, or even 13V, at least high enough that it doesn't actively drain the battery down to 12.4V as the current system does.

Well, there doesn't seem to be an affordable solution other than the headlight solution.  I've been unable to find an explanation of how the current system actually works - what sensors are involved, etc.  I'm not above mounting a man-in-the-middle attack on my alternator, but I would need to know how that all works.  And I wouldn't want to be generating all kinds of error codes.

bdunham7:

--- Quote from: Peabody on February 10, 2021, 11:20:33 pm --- I'm not above mounting a man-in-the-middle attack on my alternator, but I would need to know how that all works.  And I wouldn't want to be generating all kinds of error codes.

--- End quote ---

Unfortunately, I don't have a model-specific wiring diagram for that car and I can't find one online offhand.  Perhaps if you sign up for an Alldata or Mitchells per-car manual (I don't think the cost is very high) and obtain a wiring diagram, I could give you some ideas about how to circumvent the system.

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