Honda EM3500X Owner's Manual page 47

Battery Tray Kit (EM3500SX only)
1. Install the battery guard on the frame.
Set the battery tray on the battery guard and tighten the bolts.
2. Route the starter cable under the tank and connect it to the starter solenoid.
3. Connect the ground cable to the generator rear housing.
4. Set the battery on the battery tray and secure with the battery bracket.
Connect the starter cable to the battery positive (+) terminal first, then to
the negative (-) terminal. When disconnecting, disconnect at the battery
negative (-) terminal first.
5. Install the battery guard plate on the battery guard.
45