Here's a breakdown of troubleshooting steps:
1. Headlight Switch: This is the most likely culprit. The switch may have completely failed internally. Replacing the headlight switch is relatively straightforward, but you'll need a new switch and possibly a wiring diagram to make sure you connect it correctly.
2. Wiring and Connectors: Inspect the wiring harness leading from the headlight switch to the headlights. Look for:
* Broken wires: Check for any frayed, broken, or corroded wires. Pay close attention to areas where the wires bend and flex.
* Loose connectors: Make sure all connectors are securely plugged in at the switch, the headlights, and anywhere else along the wiring harness. Corrosion in connectors is common and can interrupt current. Clean the connectors with electrical contact cleaner.
* Grounding issues: A poor ground connection can cause all sorts of electrical problems. Make sure the ground wires for the headlights are clean and securely connected. You might need to clean the ground points on the chassis.
3. Multi-Function Switch (Turn Signal/Wiper Switch): While less likely, a faulty multi-function switch can sometimes affect headlight operation.
4. Relay (If Applicable): Some vehicles use relays for the headlights. If yours does (check your wiring diagram), inspect the relay for damage or try swapping it with a known good relay of the same type.
5. Headlight Bulbs: While you suspect it's not the bulbs, visually inspect them to rule out a completely burnt-out filament.
Troubleshooting Steps:
1. Visual Inspection: Start with a thorough visual inspection of the headlight switch, wiring harness, and connectors. This is the easiest and often most effective first step.
2. Wiring Diagram: Obtain a wiring diagram for your 1997 Dodge Ram 1500. This will be invaluable in tracing the circuits and identifying potential problem areas. You can often find these online through repair manuals or forums specific to your vehicle.
3. Test with a Multimeter: Use a multimeter to check for voltage at the headlight connectors. If you have voltage at the connectors but no light, the bulbs are likely the problem. If you have no voltage, the issue is further up the circuit (switch, wiring, etc.).
4. Professional Help: If you're uncomfortable working with car electrical systems, it's best to take your truck to a qualified mechanic.
The flickering before complete failure strongly suggests a problem within the electrical system rather than simply burnt-out bulbs. Focusing on the headlight switch and wiring is your best bet for a successful repair.
