Here's information from the Axis/Vegas Owners' Manual I compiled. It explains the operation of the Trombetta and Bi-directional Isolation Relay Delay (BIRD) system. The picture shows the BIRD as that square box next to the relay with the red wires. The relay with the red wires is the Isolation Relay also known as the Trombetta. The BIRD & Trombetta is located under the hood.
It is also possible that instead of a BIRD & Trombetta you have a Battery Control Center. In this case the battery charge state detection circuitry and isolation relays are contained in the same box. Although the circuitry and relays are different, how they function and work together is exactly as that described for the BIRD and Trombetta.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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