I wish to attach an LED indicator light across the main power to the 12V battery on my boat. This light will let me know from a convenient location whether I've remembered to switch off the main power. How do I wire it up? The LED is obviously 3V. The light would only be ON if the power switch is on. If the LED fails, I don't want it to kill the power. Do I simply splice it in parallel with the hot side of the battery wire?