Michael Gain
Full Access Member
Batt2 stud connects to the start stop battery. Batt1 is the cranking battery. Load carries the batt1 voltage from that stud, back to the fuse box.
Essentially, a zero gauge wire crosses the back of the engine and carries voltage from the cranking battery (and the alternator) to the Batt1 stud . That voltage is then transferred to the load stud and is carried back across the back of the engine by another zero gauge wire to the fuse box. Also, the voltage supplied to the batt1 stud supplies voltage to the starter solenoid and pinion relays, and activates the starter when ignition is applied.
Batt2 stud provides current to the start stop battery from the alternator, but also reads the status of the little motorcycle battery so that it knows if it contains the proper voltage to run vehicle systems while the vehicle is off.
Bottom line. The box and the little battery get in the way of putting in a large agm battery, and the system is needlessly complicated
Essentially, a zero gauge wire crosses the back of the engine and carries voltage from the cranking battery (and the alternator) to the Batt1 stud . That voltage is then transferred to the load stud and is carried back across the back of the engine by another zero gauge wire to the fuse box. Also, the voltage supplied to the batt1 stud supplies voltage to the starter solenoid and pinion relays, and activates the starter when ignition is applied.
Batt2 stud provides current to the start stop battery from the alternator, but also reads the status of the little motorcycle battery so that it knows if it contains the proper voltage to run vehicle systems while the vehicle is off.
Bottom line. The box and the little battery get in the way of putting in a large agm battery, and the system is needlessly complicated
I noticed the three large studs, two of them being tagged as Bat 1 and Bat 2.
I assume that they connect to nothing right now but it suggests LR did think of an aux battery.
I wondered what those three studs were to do?
Thankfully, my 3 does not have Start / Stop - had not yet been regarded as a good idea - sounds like the concept has since fallen out of favor - kind of like seat belt buzzers that do not go off.