User: Hello, I have a 1989 celica gt convertible that has sparks in the alternator but no visible power elsewhere any ideas?
Assistant: If you are seeing sparks in the alternator of your 1989 Toyota Celica GT convertible but no visible power elsewhere, it suggests a possible electrical issue related to the alternator wiring or connection. Here are some potential causes and troubleshooting steps that you can consider:
1. Check the Alternator Wiring and Connections:
– Loose, corroded, or damaged wiring at the alternator can cause sparks.
– Inspect the wiring harness and terminals for signs of damage or bad connections.
– Pay close attention to the main power cable and ground connection at the alternator.
2. Inspect the Alternator Belt and Pulley:
– The alternator pulley not turning properly or slipping could cause electrical arcing.
– Make sure the alternator belt is properly tensioned and in good condition.
3. Verify the Battery and Ground:
– A weak or dead battery can cause issues with alternator output.
– Check the battery connections and main engine ground straps.
4. Test the Alternator Output:
– Use a multimeter to check the voltage at the alternator output terminal.
– It should provide around 13.5 to 14.5 volts when the engine is running.
5. Look for Signs of Internal Alternator Failure:
– Alternator brushes or slip rings worn out can cause sparking inside.
– If internal damage is suspected, removal and bench testing or replacement may be needed.
Since you mention no visible power elsewhere, I suspect a wiring fault such as a short or loose connection. Sparking can cause safety concerns, so ensure the battery is disconnected when inspecting or repairing the alternator wiring.
If you need detailed wiring locations or alternator specs specific to your 1989 Celica GT convertible (which is likely an ST162 chassis for that year and model), I can help provide those from the service manuals.
Let me know if you want guidance on specific checks or wiring diagrams for the alternator circuit in your Celica.
User: I have no power anywhere in the cabin any ideas as to the cause
Assistant: No power in the entire cabin of your 1989 Toyota Celica GT convertible, combined with sparking in the alternator, points strongly to a major electrical fault such as a blown main fuse, a bad fusible link, or a main battery cable issue. Here are steps and components to check that typically cause loss of power to the cabin:
1. **Main Fuse or Fusible Link:**
– The Celica’s main fuse or fusible link is a heavy gauge fuse or wire segment that protects the primary electrical circuits.
– If this fuse is blown or the fusible link is burnt due to sparking or a short, it will cut power to all cabin electrical systems.
– Check the fuse box under the hood and look for a large main fuse or fusible link near the battery or alternator.
2. **Battery Connections:**
– Check both battery terminals (positive and negative) for corrosion or loose connections.
– Make sure the cable from battery positive to the starter and main fuse box is secure and undamaged.
3. **Ground Connections:**
– A poor engine or chassis ground can cause loss of electrical power even with a good battery.
– Check the ground strap from engine block to chassis and from battery negative to chassis.
4. **Ignition Switch:**
– Faulty ignition switch can cause no power in the cabin if the switch is not completing the circuit.
– However, sparking at the alternator suggests a more fundamental power supply or wiring fault upstream.
5. **Alternator Main Wire:**
– Since you see sparking in the alternator, the main wire from the alternator to the main fuse or battery might be shorted or broken.
– Inspect this cable carefully for damage or melted insulation.
Summary: Most likely cause is a blown main fuse or fusible link, or a bad battery cable/connection resulting in no power for the cabin circuits. Start by visually inspecting and testing the main fuses and battery connections. Use a multimeter to check for voltage at fuse box terminals with ignition ON and engine OFF.
If you want, I can guide you to the exact fuse location and testing procedure for your 1989 Celica GT convertible. Just let me know.