What Charges the House & Chassis Batteries When - Page 4 - Thor Forums
If you read this thread staring back a few pages, it gives you a lot of information on the BIRD/Trombetta issue and how to test I've your's is bad.
Basically the best way to test if the BIRD is opening the Trombetta to allow the alternator to charge the house batteries is either to put a volt meter on the house batteries with the engine running and see if you have above 13.1 v. If you are not, then you may have either a BIRD or Trombetta problem. A second (and easier way) is to test the voltages at the two large posts if the Trombetta. With the engine on or on shore power, they both should read the same. If they both read the same on shore power but not on alternator then there is probably an issue with the BIRD. There are four wires coming out of the BIRD. Two of them are hooked to the house and chassis batteries and when they sense the primary battery being charged (the chassis battery on the alternator and the house batteries on shore power/generator) at above 12.8v the BIRD opens the Trombetta to allow the other battery to charge. There is a small fuse on the wire coming out of the BIRD leading to the chassis battery. You might look at that and see if your power issue blew that fuse. It also could be your problem.
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