If you're having charging problems, you should:
1. Check the battery terminals: Make sure they're clean and tight. Corrosion can cause poor connection and charging issues.
2. Test the battery: Have it tested at an auto parts store to ensure it's holding a charge.
3. Test the alternator: This requires a multimeter and some basic electrical knowledge or a visit to a mechanic.
4. Check fuses related to the charging system: These might be labeled differently (e.g., "ignition," "power," or a specific circuit related to the charging system), not explicitly "alternator fuse". Consult your owner's manual's fuse box diagram to locate potentially relevant fuses.
In short: Don't look for an "alternator fuse". Look for issues with the alternator, battery, and related wiring and fuses within the charging circuit.