Quote:
Originally Posted by brucepick
I could foresee some issues if switching while engine is running - though I think California98Civic has been doing that for some time, via the control harness wire(s). In my case I only switch it with engine off.
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You got it right, bruce. But I don't do this a lot. Generally it is off for the trip, or on for most of a trip, depending on distance. I have not yet encountered any difficulties with the ECU. Maybe it's worth noting that the ELD in these Civics already varies the voltage quite a lot, when operating normally. Under certain conditions with the alt running you see instantaneous jumps from 12.5-14.xx--with amperage jumps too, I think--and all of it regulated by the ECU as Honda designed it. So it seems logical to me that manually switching from a scenario of 12.5 volts to 14.xx shouldn't pose problems. But I am neither an engineer nor a mechanic. I just own a Civic that I hack-up and repair as best I can.