It just sucks how hard they are making it to get a good system any more. My 08 civic was a simple eld unplug and it was set for a h/o alt and my system was nice. Now, my 13 civic is not looking like it'll be able to support anything close to what I had for who knows how long. My friend does custom installations at a local shop and says it's getting harder every year.

 

Just an update on me trying this on my 90 accord. The voltage potential of the green/red and black while minimally loaded, was about ~2.5Vdc, when loaded down I recall seeing as low as 500mV dc. I used 1/2w resistors, which may need to be upgraded to 2w as I was measuring 870mA through the resistor along with a drop of about 1.9V, however it did not get warm and I am keeping the resistor ventilated for the time being while I "test".

I did not have an 820 ohm to try, but I did series a 330 and 470 to achieve a measured 790 ohms, this gave me about 2.1v. I swapped that for a 680 ohm to get 1.9v dc. I drove the car for about an hour without the alternator shutting off at any point, it remained at the 14.0-14.4v range unless under heavy load, a/c, etc, and even then it would return once I turned the a/c off. I won't be able to drive this car for a few weeks, but when I can again, I will report back with an update and hopefully I can add to the thread concerning the 90-93 accords.

 

thanks for the update. to calculate current, just use ohms law to determine what wattage rating the resistors should have.

5V source with 800 ohm resistor
Current is volts/resistance = 5/800 = 6.25ma
Power is I^2 * R = .00625^2 * 800 = 31.25mW

an 1/8 watt resistor is good for 125mW.

 

Hope, have you had a chance to work on a bypass?

 

we do know the ELD exists and this is the charging system


large version is available by going to my photobucket page then clicking the expand icon (lower right) twice
http://i38.photobucket.com/albums/e1...matic22x34.png



it's on my to-do list. i need to get a meter setup in the car so i can monitor voltage. then i can do some bypass testing on the ELD.

 

i learned a few things about the charging system behavior today. i finally put a voltmeter in the dash.

under normal conditions, the alternator maintains 12.5VDC. even under load of A/C or the sound system the voltage didn't move while the car was driving. so the alternator maintains 12.5V on purpose. however, under braking the voltage would climb to 14V - indicative of regenerative braking. even if the car was simply slowing (i.e. turn off cruise) the voltage would climb - so the PCM uses the alternator as a load to both assist braking and provide regenerative charging.

of note - when the headlights are turned on the voltage climbs to 14.4V and stays there.

i did not observe any typical ELD behavior during 4 hours of highway driving.

 

i posted two videos on my uTube channel showing charging behavior

 

Great start, really appreciate all the work you do and look forward to what more you find out.

 

i'm starting to think that they voltage may increase with the lights due to the ELD. i'll be looking at a bypass for it next.

 

Do you think the increase in voltage from the lights and brakes would be bypassed together or are they separate issues?