Thor Forums

[scrubjaysnest]

The Trombetta ties the house batteries together under 3 conditions when the BIRD and emergency switch are powered correctly from the house batteries.
1. The motor is running and alternator output is above ~13.2 volts.
2. Any time the motor is off and the house batteries go above ~13.2 volts
A. Shore power will do this.
B. Running the generator will do this.
C. A solar system will do this.
In the above cases there is a time delay before the Trombetta is "closed";
this is a normally open isolation relay until you put power to it.

3. If you press and hold the emergency start button this will also put power to the Trombetta. No time delay.

Eds write up on this is very clear, the wiring diagrams that I hand verified, also agree with this.

Mine did not work this way until I moved the yellow wire from the cranking side, chassis, of the Trombetta to house side per the drawings.


In all our years of RVing the house and cranking batteries were not tied together until an isolation relay between the two was powered up. Might be the ignition switch turned to on or some system like the BIRD.