POWER SUPPLY CIRCUIT FOR VEHICLE

摘要

PURPOSE:To avoid an electrically complex structure by constructing a lighting fixture of a steering wheel to be lighted through an existing rotary contact with correspondence to the turning-on, off of a light switch at a first level voltage while to be unlighted at a second level voltage. CONSTITUTION:Body side machinery switches 3-5 and a lighting fixture 6 are connected in parallel between a first contact 7a secured to a steering wheel 1 and an earth terminal. While the (+) terminal of a battery B constituting a first power source circuit for a first level voltage is connected to a second contact 7b at the body side and a regulator 8 for a second level voltage 5V is connected through a coil 9a of a first relay 9 and a counterflow prevention diode 10 then grounded through a light switch 15. With such arrangement, the lighting fixture 6 is lighted through an existing rotary contact 7 with 12V voltage to be applied upon the turning on of the light switch 15 while unlighted with an insufficient 5V voltage to be applied upon the turning off of the light switch 15.