Suzuki Carry: daytime running lights on a ground-switched headlight
Problem. The Carry's H4 headlights are switched on the ground side, while standard daytime running light modules output +12 V. Off-the-shelf kits do not work on this system without cutting factory wiring.
Solution. A two-relay harness that mounts entirely at the headlight corner. Relay 1 converts the module's +12 V signal into a ground path for the low beam. Relay 2 watches the high-beam wire and tells the module to drop the running lights, so two filaments are never lit at once.
Result. Three tap points only (the wiper circuit, the H4 plug and a chassis ground), joined with Posi-Tap connectors. The harness does not run to the battery or cut any factory wire, and it unplugs to return the truck to stock.