Honda’s Dual Mode Charging System

Discussion in 'Mechanical Problems & Technical Chat' started by SavageWS6, Dec 14, 2018.

  1. SavageWS6
    • 2018 Toys For Tots

    SavageWS6 Well-Known Member

    Messages:
    156
    Vehicle Model:
    Si
    Body Style:
    Sedan
    So, I've been doing quite a bit of reading on Honda's electrical system and knew Honda had something where the alternator would go into low-output mode but couldn't find any good article on it. Found this PDF tonight on it that explains it all.

    I started noticing voltage fluctuations (using my on-board radar detector voltage output readout) and saw battery voltage kept dropping really low even in low-output mode. Battery was toast, but if you like getting technical with electrical systems. It's a nice read. Reason I was looking for this was because of a amp install I am doing and looking for the max amp output for my 2013.

    https://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=auto_pres
     

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  2. webby
    • Staff
    • 2018 Toys For Tots

    webby Administrator

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    Are you going to swap to a higher output alternator?
     
  3. SavageWS6
    • 2018 Toys For Tots

    SavageWS6 Well-Known Member

    Messages:
    156
    Vehicle Model:
    Si
    Body Style:
    Sedan
    As of right now, I am not. I don't know the true max amperage for the alternator. The part isn't listed on Denso's site for the OEM part. I contacted them via email and was told the Product Specialist will be back in Dec 17th. So hopefully I find out the real numbers. Looking at 8th Gen Part Denso DAN1375 looks like 105A. I have a Fluke 375 on hand so I'll be checking alternator output and what the amp is pulling.
     
  4. webby
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    webby Administrator

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  5. ruddyrid

    ruddyrid Well-Known Member

    Messages:
    35
    Location:
    The Whitehouse
    I am actually looking into by-passing the ELD system as well, in order to have full ~14 volts output at all times. I'll try and report back if I'm able to accomplish this in the next few days.
     
  6. ruddyrid

    ruddyrid Well-Known Member

    Messages:
    35
    Location:
    The Whitehouse
    Was able to disable ELD via the FlashPro. There's a setting available on the 9th Gen Si calibrations under the Misc. section. The option you need to disable is the 'Fuel economy alternator control' and this will allow the alternator to constantly output ~14.2 volts.
     
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