To find a specific ground wire, you'll need to know what circuit you're troubleshooting. For example, are you looking for the ground for the headlights, the radio, the engine, etc.? The location of the ground will be different for each circuit.
To find a ground wire:
* Consult a wiring diagram: A 1990 Cadillac Seville wiring diagram is your best resource. This diagram will show the location of all grounds for each system. You can often find these online through automotive repair manuals (like Chilton's or Haynes) or specialized automotive websites.
* Trace the wire: If you know the component that isn't working correctly, trace the negative wire from the component back to where it connects to the chassis. This will be your ground point.
* Look for heavy gauge wires: Ground wires are typically thicker than other wires to handle the current. Look for these thicker wires connected to the metal body or engine block.
* Common locations: While not exhaustive, some common areas to check for ground connections include:
* Engine block: Numerous grounds connect to the engine block.
* Firewall: Often a ground point for many components.
* Body: Various points on the car's body, often near large metal surfaces.
* Battery negative terminal: While not a ground *point* in the same sense as the others, the negative battery cable is the main ground for the car's electrical system.
Without knowing the specific circuit you are working on, it is impossible to provide a more precise location. Using a wiring diagram is crucial for accurate troubleshooting.
