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Old 04-29-2019, 10:09 PM   #3
Junior Member
Brand: Thor Motor Coach
Model: Vegas 25.2
State: British Columbia
Posts: 15
THOR #11108
Originally Posted by Oneilkeys View Post
That is weird. I agree with your analysis on the BIRD intermittently not turning off the Trombetta, but from my experience I would think that it would be the coach batteries that discharge to nothing while the chassis battery would stay at 11V. Even with the use/store in store, Unless I hit the 100 amp breaker in the battery box, my coach batteries quickly discharge while the chassis battery discharges much more slowly. I can still start the coach after several weeks or more not being plugged in. By that time, my coach batteries would be dead. Since it happens so infrequently, it is very difficult to diagnose. One diagnosis you could try would be to open the 100 amp breaker in the battery box and see what happens. If the chassis battery still discharges quickly down, then it would indicate a problem at that end. The only other thing that I could suggest is that you monitor the voltages in the coach and chassis batteries to see if the Trombetta opens to disconnect them at the correct voltage. Since it happens so infrequently, it might take a long time to see anything. However, if the Trombetta is disconnecting at something different than 12.6, that would indicate something wrong with the BIRD or Trombetta - most probably the BIRD. The BIRD in my Axis was wired incorrectly at the factory so the coach batteries did not get charged by the alternator. But I cannot see how that can be the case with your problem.
Some good thoughts there, thanks.
In my case the BIRD is wired permanently and directly to the chassis battery so if the BIRD is energizing the Trombetta ,once it drops out all the load has to come from the chassis battery and so it would go completely dead. The coach batteries are slightly protected by the Trombetta not being able to stay closed with very low voltage.

Right now have charged all batteries and the BIRD has again closed the Trombetta. I will let both battery voltages drop to try to see if the BIRD drops out and at what voltage. The risk is that this happened so rarely that it might not show. If it happened every time it would be easy to troubleshoot. I guess I could just bite the bullet and replace the BIRD but I hate just changing parts unless I know for sure that is the problem.
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