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I'm installing a manual momentary push button to fire the glow plugs in case the card gets fried. I also want to add a dash-mounted LED to indicate when power is actually being delivered to the glow plugs. I have read all the posts in the sticky regarding such an LED, however there is no reference to which wire coming out of the card should activate the LED. Has anybody done this? If so, which wire should the LED be powered from?