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Old 03-31-2012, 03:56 PM   #10 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by steffen707 View Post
Hey, i've got a 96 civic hatch, same Gen as your 98 and I've heard people say that even with the 4 wire connector plug removed, the alternator will still output 14 volts through the large white "charging" wire. Have you tested the volts after you switch it off?
I have a dash mounted volt meter. Unplugging the 4P plug will always keep the alt completely off. It cannot power-up itself through the thick white charging wire to the battery. My switch disables two of the wires in the 4P connector. If the alt is running and I cut the switch, the alt still charges until I cut the injectors and bump start again. But according to some, a small light on the line can drain the residual charge in the field windings (I have not tried this).

Originally Posted by steffen707 View Post
I've got a 96 hatch with a d15z1 lean burn motor in it, and there just isn't enough power in lean burn at 65mph for me to hold that speed. I'm thinking that killing the alternator might give me that boost I need.
You might try taking the powr steering belt off as a test of this idea. It's easier than an alt disable and completely reversible.

Originally Posted by steffen707 View Post
Also do you know if using a large relay on the white charging wire and just disconnecting it can harm the alternator if the field is energized?
I believe the answer might be yes, because the alt will be generating power with nowhere to go. But why would you want this? The power generation itself would still be a parasitic draw on your engine.

I hope those answers help.
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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