Will this switch work with my factory wiring harness?

The switch uses an OEM-style connector, but verify your vehicle's pinout before connecting. Mismatched wiring can disable lights or trigger warning lights — test with parking lights first.

Do I need a relay or module to make the fog lights work?

The switch has integrated circuits built in, but your vehicle's fog light harness must already exist and be powered. If your car never came with fog lights from the factory, additional wiring and a separate relay will be required.

Can I return this if it doesn't fit my dash opening?

Contact ModSupply directly with photos of your dash and the switch connector before purchase. Once installed, electrical components fall under a no-return policy due to safety concerns.