What are the 3 relays on fire wall of a 1996 Chevrolet Blazer ls?

There isn't a definitive answer to which *three* specific relays are on the firewall of a 1996 Chevy Blazer LS, as the exact relays present can vary slightly depending on options and trim level. The firewall is densely packed with relays and fuses. To know for sure, you would need to consult a wiring diagram specific to your Blazer's VIN.

However, you'll *likely* find relays controlling major systems there, such as:

1. Fuel Pump Relay: Essential for starting and running the engine. This is a very common relay found on the firewall.

2. Ignition Relay: This relay is part of the ignition system and will be involved in supplying power to the ignition coil.

3. Cooling Fan Relay: Controls the electric cooling fans for the radiator.

To find them: You'll need to locate your Blazer's underhood fuse and relay center (usually near the battery). Consult your owner's manual, or a repair manual for your specific year and model, for diagrams showing the location and function of each relay. Many diagrams are available online if you search for "1996 Chevy Blazer LS fuse box diagram". Remember, the diagrams are visual aids – always double-check the relay location against your vehicle.