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Old 04-28-2015, 01:18 PM   #31 (permalink)
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Black and Green - '98 Honda Civic DX Coupe
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Originally Posted by oldtamiyaphile View Post
I'm really impressed Honda were doing it all those years ago. Do you know how the alt is controlled? I wonder if it could be a simple retrofit for 'dumb' units. Based on my experience with 'smart' alts, there's a good 5% gain to be had with no drawbacks.
I think you might need the ECU as well as the Electric Load Detector unit (ELD). Daox is probably correct that it is a bit more complex. There are several wires into the alt... a 4 or 5 pin connector, IIRC. In fact, even with my switch, once I turn the alt on, putting the switch back into off does not shut the alt down, inly cutting the engine will do that. Works well enough.



See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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Old 04-28-2015, 10:06 PM   #32 (permalink)
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My 2006 Acura TSX has a 4-pin control plug to the alternator. It de-energizes when the 4-pin is unplugged, and re-energizes when plugged back in. Output voltage is determined by the ELD (Electric load detector), which is one of the 4 wires going to the alternator.

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