| 摘要 |
A power supply voltage change-over apparatus for a vehicle has a parallel/series connection change-over relay 4 which connects two batteries 1a, 1b in parallel when an ordinary load is used or the batteries are charged, and which connects the batteries in series when a large power electric load is actuated opening and closing state of each contact 5a, 5b or 5c of the relay 4 is detected by a terminal voltage Ea or Eb of a switch 7 for actuating the large power electric load, and the detected voltage is inputted to a controller 8. The controller distinguishes the failure of a normally open contact 5a, 5b or 5c, and prohibits further operations of the apparatus, whereby short-circuiting of the batteries can be prevented.
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