| 摘要 |
A system for providing an indicator light operated by a fluid level sensor, including a power source providing the voltage to a first node, a first LED and a first circuit branch connecting the first node to ground, a voltage dropping component in the first circuit branch, a second circuit branch including a second LED connected to the first node in parallel with the first LED, and a normally open first fluid level switch that can close to connect the second circuit branch to ground. The sum of the turn on voltage of the first LED and the voltage drop across the voltage dropping component when the first LED is on is greater than the voltage drop from the first node to ground through the second LED when the first switch is closed, so that the first LED is normally on when the first switch is open, and the second LED is on and the first LED is off when the first switch is closed. The first LED is preferably a system operation light for a watercraft lubrication system and the second LED is a caution or warning light indicating that lubricating oil levels have fallen below a predetermined point.
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