Thor Forums

[bevedfelker]

Greg: I attached a file I had that some BIRD troubleshooting hints for the coach batteries not charging and the chassis battery not charging.

The problem might be the isolation relay (often called the Trombetta) shown in the schematic. Here is some troubleshooting tips for the Axis/Vegas Trombetta provided by Oneilkeys on the forum:

"If you have a volt meter, plug into shore power and measure the voltage at the chassis battery. If the system is working correctly, after a few minutes the voltage at the chassis battery should read above 13 volts - it should read the same voltage as the house batteries which are also being charged. Since the chassis battery terminals are not that easy to reach, I find it easier to read the voltage off of the two large terminals of the Trombetta on the right side (driver's side) front of the engine. It is easily accessible with the front grill down. The voltage should be the same at both terminals is both the house and chassis batteries are charging. Put your red wire from the voltage meter on one of the large terminals and the black wire on any silver bolt in the area for a ground. In my Axis the left hand Trombetta terminal (looking at it from the front) is connected to the house batteries and the right hand one is connected to the chassis batteries. If you search Trombetta and BIRD in this forum you will learn more than you want to learn about this subject as well as how I fixed mine."