Honda FourTrax Foreman TRX500FE2 2018 Owner's Manual page 65

Controls & Features
Be sure the engine is on and the headlights are turned off before
using the accessory socket, otherwise you may drain the battery.
The accessory socket's rated capacity is DC 12 V, 120 Watts (10 A)
or less. If you exceed this limit, you may blow a fuse. See If a Fuse
Blows, page 231.
When you are done using an accessory, unplug it, and cover the
socket with the cap.
Be careful not to flood this accessory socket when washing your
ATV.
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Instruments & Controls