| Component | Typical Location | Notes | |-----------|------------------|-------| | | Under dashboard, driver’s side (left-hand drive vehicles) | Most common location for trailer lighting fuses, especially for turn/brake signals. | | Secondary fuse box (engine bay) | Near battery or in a black plastic box under hood | Often contains fuses for tail/running lights and the trailer lighting relay. | | Trailer tow module fuse | Engine bay or rear cargo area (near spare tire) | On vehicles with factory towing packages; sometimes a large fuse (20–40A). |

The fuse for trailer lights is almost always located in the vehicle’s interior or engine bay fuse box , not on the trailer itself. It is rarely a single fuse; instead, separate fuses protect different trailer light functions (left turn, right turn, tail/running lights). The exact location and labeling vary by vehicle make and model.

To identify the standard location(s) of the fuse protecting the trailer lighting circuit on a towing vehicle, and to provide guidance for troubleshooting.

Trailer Lights Fuse: Typical Location & Identification