'05 35 Cabo - Where does the "Always On" ECM Get Power From?

[HP12Sea]

Trying to find out where the ECM Always On studs (Pictured with arrows attached) are connected to their constant supply. I know it's not directly to the batteries as they are all 4 gauge wiring in the battery box and when trying to trace them, I can't see well enough into the area behind the Cabo symbol with all the red breakers and main wiring to locate them, hence my question.

Been having some issues with motor staying running and the thought is the ECM is losing power when running making the SmartCraft gauges and motor just die instantly.

I hooked a voltmeter to them and sometimes they read 14+ volts (when shore power/battery charger or engine is on) and other times it only reads 10 or 11 volts while batteries are all 12.5, when shore power/batter charger is off.

Thanks in advance,

J