A vehicle's reverse lights are always on, even in "drive." What is the most likely cause?

a. A misadjusted neutral safety switch
b. An open neutral safety switch
c. One of the reverse light bulbs has been installed backward
d. The wrong bulb was installed for the reverse lights


a. A misadjusted neutral safety switch
A misadjusted neutral safety switch is the most likely cause of the backup lights remaining on all the time. Most neutral safety switches contain contacts that close when the gear selector is in reverse to send current to the backup (reverse) lights. Answer b is not correct because an open switch means that no current will flow through the switch. Answers c and d are not correct because even if the bulb were installed backward, the lights would not remain on because the power comes from the neutral safety switch.

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