Here is the correct location for Back up / Reverse power according to OEM instructions for the backup alarm for the Honda Pioneer 1000.
The amp rating for this wire is 15 amps combined including all other items tied into the 15amp "Acc" fuse.
Location includes a positive and a ground trigger.
Positive is "Key On" and can also be used as a Key On source for the rear.
Ground trigger is only active when in Reverse!
Unfortunately, It is a little difficult to access.
Here is the back-up alarm instructions for more details -
P1k - Back-Up Alarm Harness - 08Z76-HL4-A00 - Instructiosn | The Honda Side by Side Club!
This plug can been seen by looking up and under just in-front of the rear drivers tire. Looking towards the oil filter and on past to the frame you will see a un-used wire. It will be 2 wires with a white plug.
The plug is sealed with a plug. See back-up alarm harness instructions.
Here are some pictures from a Pioneer 1000-5.
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