| 摘要 |
a light source(1) which is turned on/off by ignition voltage and placed on a coner of engine oil case; a light sensor which is turned on/off by a light source(1) according to the transparency of the oil, the first switching diode which is switched on/off according to the output of the light source(1); the first relay(4) which is operated by an alternator power source and is connected with the first switching diode; the second relay(5) which is connected with the first relay(4) and is switched with the first switching diode; and an exchange displaying lamp(6) which is connected with the second relay and is turned on when the light sensor is off.
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