my Toyota Camry's lights dim when I turn on the AC what's going on

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Battery Inspection and Replacement

• Inspect Battery: Remove the battery terminals and clean any corrosion with a wire brush.
• Test Battery Voltage: Use a multimeter to check the voltage; if it’s below 12.4 volts, consider replacing the battery.
• Replace Battery: If necessary, remove the old battery and install a new one, tightening the terminals securely.

3. Alternator Testing and Replacement

• Check Alternator: With the engine running, measure the voltage at the battery terminals; if voltage is low, the alternator may be failing.
• Remove Alternator: Disconnect the electrical connectors and the serpentine belt. Unbolt the alternator and remove it from the engine.
• Install New Alternator: Position the new alternator in place, bolt it down, reconnect the electrical connectors, and reinstall the serpentine belt.

4. AC System Inspection

• Inspect AC Compressor: Check the compressor for signs of wear or damage. If it is drawing too much power, consider replacing it.
• Replace AC Compressor: Disconnect refrigerant lines, electrical connectors, and remove mounting bolts. Install a new compressor and reconnect all lines and connectors.

5. Reconnect and Test

• Reconnect the negative battery terminal.
• Start the vehicle and test the lights and AC functionality to ensure the issue has been resolved.