[November 1, 2022]

I installed the new GTN650xi last night in order to get the new System ID off of it to transfer my databases from the old 650 to this one. I called up Garmin today, and to my surprise, my new System ID was identical to the old one! How is that possible? Well, it took me about 0.005 seconds to realize the System ID is stored on the configuration module, which is in the connector. So since I used the same configuration module, I kept the same System ID, I could of just loaded the new databases onto the SD card and been good. The guy who I spoke with at Garmin was top notch, and updated the model of my GTN on the fly.garmin.com website. The other nice thing about the configuration module is it kept all of the settings for ARINC, serial ports, etc.. So this truly was a plug and play install!

I bought a second G5 to replace my steam altimeter. Since I installed the LPM on my first G5 last night, I figured I might as well install the second one tonight while the information is still fresh in my head. In a two G5 system, the second unit needs a jumper from PIN3 (UNIT ID) to ground to indicate it's the second unit. This seemed the simplest way to accomplish that with some solder and heat shrink.

The wiring of this LPM wasn't all that bad since there was enough slack to feed the connector through the hole the altimeter used to be in.

I hooked up the essential wiring (ground and aux battery) and the unit fired up!

However, it didn't seem to like the primary G5.

Digging deeper, seemed the issue was the primary G5 was running firmware version 8.00, and the new unit was 7.30.

I had a microSD card with 8.00 of the G5 software on it, so let's just do the upgrade....


AHhhhhhhhhh....sweet success - and the GMU11 magnetometer was shown on the CAN bus.

I was able to finish up all of the wiring tonight, which was a SHOCK to me. Not that it was a lot - CAN bus was already there - just needed to deal with the LPM B.S., ground, 2 power connections and a GPS input.

Tomorrow or the next day will be the pitot/static hookups, which I am expecting should be quite easy.



Last Modified: May 16, 2024