- Voltage Regulator Issues: The voltage regulator is a crucial component that controls the alternator's output. A faulty voltage regulator can cause the battery and brake lights to come on intermittently. Have it tested or replaced if necessary.
- Faulty Battery: Despite having a new starter, the battery itself could still be the culprit. Check the battery's age, health, and connection terminals. Replace it if it is old, damaged, or has loose terminals.
- Alternator Belt Issues: Ensure that the alternator belt is in good condition, properly tensioned, and not slipping. A loose or worn belt can affect the alternator's ability to generate electricity.
- Starter Draw: While you mentioned a new starter, excessive current draw when starting the engine can put a strain on the electrical system and briefly trigger the battery and brake warning lights. Have this checked by a mechanic.
- Brake System Malfunction: Although the brake light is typically associated with the brake system, sometimes electrical issues in the brake system, such as faulty sensors or switches, can cause the light to come on briefly with other electrical problems.
- Faulty Instrument Cluster: In rare cases, the issue could lie within the instrument cluster itself. Faulty wiring or a malfunctioning gauge cluster could be responsible for the intermittent warning light behavior.
- Electrical System Overloading: If you've added additional accessories or modifications that draw significant electrical power, the electrical system may be overloaded, causing these warning lights to come on briefly.
Consider taking your vehicle to a qualified mechanic or auto electrician to have these possibilities investigated and for a more thorough diagnosis.
