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I would not touch any reference voltages with the ecu. I like the brake light switch recommendation as it's 12v and not ecu/tune impacting at all. Just put the relay in series with the clutch feed so only when ac is running. Cost is near nil.
You could also use a shift light with programmable 12v output to kick a relay as well.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
Last edited by Lapkritis; 08-24-2013 at 06:15 PM..
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