1. Fuses: This is the easiest and most common culprit.
* Locate the fuse box: Your Silverado likely has two fuse boxes – one under the hood and one inside the cabin (often under the dash). Consult your owner's manual to identify the correct fuse box and locate the fuse(s) for the DRLs. They might be labeled "DRL," "Daytime Running Lights," or something similar. If not explicitly labeled, look for fuses related to headlights or parking lights, as DRLs often share circuits.
* Inspect the fuse: Carefully remove the fuse and examine it. Look for a broken filament (a thin wire inside that's broken) or a blown fuse (the internal wire will be melted or discolored).
* Replace the fuse: If blown, replace it with a fuse of the *same amperage rating*. Do *not* use a higher amperage fuse. If the new fuse blows immediately, you have a more serious short circuit.
2. DRL Module (if equipped): Some vehicles of that era had a separate DRL module. This is less common, and your owner's manual will be crucial in identifying its location (if it exists). A faulty module may need replacement. This is typically more difficult than a simple fuse replacement and may require professional help.
3. Wiring: Damaged or loose wiring is another possibility.
* Check for visual damage: Inspect the wiring harnesses connected to the headlight assemblies and any related components (DRL module, if present). Look for frayed wires, broken connections, or corrosion.
* Check for loose connections: Make sure all connectors are securely plugged in. Sometimes, a simple re-connection will resolve the issue.
* Trace the wiring (advanced): If you suspect a wiring problem, you may need to trace the wires from the headlight switch to the headlights and DRL module (if equipped). This is more advanced and requires electrical knowledge. A wiring diagram from your owner's manual or a repair manual will be essential.
4. Headlight Switch: A malfunctioning headlight switch could also prevent the DRLs from functioning. This is usually less common, but worth checking if other steps yield no results.
5. Headlight Bulbs: While unlikely to cause a complete DRL failure, if the bulbs are burnt out, the DRLs might not function as they're intended to use headlight components.
6. BCM (Body Control Module): This is a less likely but still possible culprit. The BCM manages many electrical functions, including DRLs. A faulty BCM usually requires professional diagnosis and repair/replacement.
Important Notes:
* Safety First: Always disconnect the negative (-) battery terminal before working with any electrical components to avoid electrical shock or damage to your vehicle's computer systems.
* Owner's Manual: Refer to your 1996 Chevy Silverado owner's manual for detailed information on fuse locations, wiring diagrams, and other relevant information.
* Professional Help: If you're not comfortable working with automotive electrical systems, take your vehicle to a qualified mechanic for diagnosis and repair.
Start with the fuses and work your way down the list. If the problem persists after checking fuses and connections, it's best to consult a professional.
