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Automotive Service Home Help

Parts needed:

  • 8 feet strong gauge wire


This is a simple design to turn off headlights when ignition is switch OFF or on ACC. When ignition is switch ON and headlights are turned on, the headlights will stay on even during driving, however, headlights will turn off automatically while cranking.

How it works:

The underdash fuse, which is used for wipers or etc.. carries 12 V power when ignition is ON. That power will flow to the headlights underhood fuse slot to then flow through to your headlights and parking lights. If you don't know which slots to use, for example upper or lower sockets, keep trying either sockets until your project works. Caution: This configuration is not recommended if you use high beam or drive mostly during the night. See the correct way. Also, do not send ground into any fuse sockets.

I don't want to use a relay

Main Relay

FIX: how to repair the main relay-all models.

Don't know what ignition positions or wire colors means? Click here

Fluid Replacement

This dotted line is the wire that you will connect from your dash fuse to your hood fuse.
Automotive Service Home Help
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