There is only one Trombetta in the Axis/Vegas. It is located on the right front when you open the hood. Here is a picture of the Trombetta with the BIRD next to it. One side if the Trombetta is connected to the house batteries and the other to the chassis battery. It us noting more than a relay that opens and closes to connect and seperate the two battery banks. The BIRD (right next to the Trombetta in the picture) tells the Trombetta when to open and close based on the voltage readings from the batteries. According to the Trombetta guy I spoke with the Trombetta almost never goes bad. It is just a simple relay. If anything hoes bad it s the BIRD or (more likely) the connection of the BIRD to the batteries.
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