* Under the hood, in the fuse box: This is the most likely location. The fuse box is usually located near the battery, often on the fender well or inner fender. The relay itself may be inside the fuse box or in a separate relay box attached to it. Look for a relay that's labeled "horn" or has a symbol resembling a horn.
* Under the dashboard: Less common, but possible. You might find it near the steering column or fuse box under the dash. This area can be difficult to access.
To find it:
1. Consult your owner's manual: This is the best first step. The manual should have a diagram showing the location of all relays and fuses.
2. Check the fuse box under the hood: Carefully inspect all relays in the fuse box. If you're unsure about a relay's function, consult a wiring diagram or online resources specific to your year and model.
3. Trace the horn wire: If you're comfortable with basic car repair, you can trace the wire from the horn itself to find the relay. This might require removing some trim pieces. Be cautious when working near the battery.
If you can't locate it after checking these areas, you might consider seeking help from a qualified mechanic or consulting a dedicated repair manual for your specific 1988 Chevy G-20 van. Providing the engine size (e.g., 5.7L, 6.2L, etc.) might also help narrow down the possibilities.
