I found the following info in the fine print at the bottom of the Odyssey info pdf:
Quote:
Trickle chargers that do not have a regulated trickle charge voltage between 13.5V and 13.8V (no lower than 13.5V and no higher than 13.8V) will cause early failure of the Battery. Use of such chargers with the Battery will also void the Battery’s warranty. For applications where an alternator is present, the alternator must deliver between 14.0V and 14.7V when measured at the Battery’s terminals. Alternators that do not have a regulated charge between 14.0V and 14.7V (no lower than 14.0V and no higher than 14.7V) will cause early failure of the Battery
You can check your trickle charger thingie and see if it's in spec. It sounds like it is, but it will give you a perspective when you measure your car's voltage at the battery terminals while it's running. You should see 14.0 - 14.7 but you may need to give the engine just a few RPM's to see that. It should read over 14.0 by 2000 RPM easily. If you don't see that it means your alternator and it's voltage regulator are not working properly yet.
The diagram of the ELD doesn't seem to give enough info to diagnose this really. It doesn't show what is inside the voltage regulator block. In some systems the alternator warning lamp is part of the voltage regulator circuit.
If you are not using the factory ECU, from the civic forums description the ELD is not doing anything useful.
Honestly, I'm not sure what to suggest. At least remove the ELD and then put in some type of voltage regulator. I think that is the low cost and simple solution. There should be descriptions of how to do this, maybe even your ECU company would recommend a simple voltage regulator?
The last time I had to work on this stuff was a good 30 years ago so I don't have good advice, sorry...