After I completed all the wiring I reconnected the House and Chassis batteries, and switched the remote BlueSea switch to Off. I did not turn the ignition on or start the engine, you don't need to for the Sterling to turn on so you can adjust the settings. I simply closed the two circuit breakers and all Sterling's LED lights lit up and the fan started. During this initial startup you only have a short window of opportunity, a few seconds, to change the battery type setting by pressing the little black Select button until you see the very top LifePo4 (Lithium Iron batteries) light on. Then I waited until the 2 little blue lights by the Setup and Select buttons went off. That means the setting was saved.
(NOTE: If you miss the initial startup window to change the battery type settings. Hold down both buttons on the front panel (SELECT and SETUP/ENTER) for more than 10 seconds (less than 20 seconds!). All LEDs on the left column shall now flash. By using these two buttons toggle through the various profiles. The right button, Select, is up the column and the left button, Setup, takes you down the column. The LED shall light up demonstrating which profile you have selected. When the LED has illuminated at your desired profile simply leave the charger alone for 30 seconds and it will store the change. The chosen profile LED shall then flash. The unit shall then restart and go through the starting cycle again.)
If you press either of the 2 buttons then you wake it up and you should see the following lights lit, LifePo4, 12.2v or 12.6v Input voltage (chassis battery input voltage), 14.6v and 14.2v Output voltage (both of these lights lit means the actual Output voltage is/will be 14.4v when bulk charging), and the 13.4v output voltage (actual output voltage during battery float mode). Then I waited for it to go to sleep again and then I pressed either Settings or Select button to wake it up. Then I pressed and held the Setup button, counting its blue light flashes (each flash is 1 second) until I reached 45 and then released. This puts the Sterling into PURE IGNITION MODE, so it only turns on with a live ignition. This is ideal if you do not want house battery charging at all when the engine is off. I wanted my Sterling in this mode to try and head off the possibility that it would try to turn on if it sensed voltage on the Battery In cable when the Trik-L-Start started charging the chassis battery from the house charging systems when parked and ignition is off. The other Sterling modes just put the Sterling to sleep so it is always looking for a Battery In voltage to wake it so it can goes to work. This function is at the heart of why the Trik-L-Start may have incompatibility issues.
Once I completed the Sterling setup, I waited for it to go dark and I flipped the Trik-L-Start switch on, it immediately went into charging mode. As I continued on with finishing my installation, I continued to monitor the Trik-L-Start and Sterling. The incompatibility issues that others reported never appeared and everything is working as expected. Now my chassis battery will always be maintained from the House charging systems! Remember I have a 2014 Unity on a 2014 Mercedes Sprinter 3500 chassis so my experience may not translate to the newer models. I can only report what I experienced with my installation on my 2014 Leisure Unity model. So this is a warning, results may not be typical.
I cut some slits corresponding to the hole in the stiff foam topper for the seat base for added ventilation. When I tightened down the seat to the seat base I marked all the bolt heads so it would be easy to tell if any work loose in the future.