Originally Posted by Honda27# (Post 399902)

Can a 30 / 40 a relay use instead of a 20 a relay

Originally Posted by peabody (Post 393227)

It's been a while, and I wanted to return to this subject. I would like to be able to drive in the daytime without having to turn my headlights on, but my understanding is that the ELD bypass doesn't work for 9th gen cars like my 2012 Civic LX, and later models. They have an ELD, but apparently other inputs to the computer also affect the alternator voltage, so the 820-ohm resistor doesn't work. At least I haven't found any report that anyone was able to make it work. I haven't tried it on my car because getting access to the bottom of the fuse box appears to be a major undertaking which I would rather not undertake unless I can be pretty sure the mod will work. If I'm wrong about the bypass not working for later models, I hope someone will correct me, and direct me to a link.

There are two mysterous sensors on the negative battery terminal. I think one senses current into and out of the battery. I don't know what the other does. Is it possible that either or both of these sensors affect the alternator voltage?

Then there is the alternator. I was hoping for a three-wire ot four-wire connection, but instead I see a single control line, which I assume means it's CanBus. So I was thinking perhaps it would be possible to perform a man-in-the-middle attack on the alternator, inserting an Arduino-based controller into the CanBus line. It would receive the control messages from the computer, and pass those along to the alternator, but never pass on instructions to go into low-voltage mode.

Actually, I also wondered whether there might be a way to just change the voltage level of low voltage mode - so it would be, say, 13.2V instead of 12.4V as mine is. Then I think the battery would stay charged and not die quickly as it does under the Honda dual mode system - unless you keep the headlights on.

Well, I just wondered if I had missed the solution to this problem. I also wondered if this problem persists with the new Hondas. If so, I might need to see if Toyota or Hyundai models are free from it. Shame on Honda for getting their MPG ratings at the cost of frequent battery replacement. I guess the economics work for Honda, but they certainly don't for the customer.

Originally Posted by keep_hope_alive (Post 395869)

I still haven't bothered to dig further into the 9th gen ELD bypass, but i'm starting to get annoyed at the low output voltage and may be enticed into developing the bypass this winter (at 195k mi.).