Quote:
Originally Posted by JacobAziza
What might be slightly more challenging is finding a normally closed relay.
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A typical automotive 30A relay (at least all the ones I have used) can be used normally open or normally closed. There are 5 pins. 2 for the coil. 1 for the common terminal. 1 for normally open to the common terminal. 1 for normally closed to the common terminal.
I would just tap into the a headlight wire and use it to power the relay coil. Run your DRLs through the relay, normally closed, so when the headlights are on, it will break the circuit to the DRLs. I've never used a diode but it certainly couldn't hurt.