You can power the APM on the receiver input power bus rails. If you are not planning on driving any servos during your testing, then you can leave jumper J1 off. I would not recommend powering the APM servo output power bus (J1 installed) with either the PM or a BEC on the APM receiver input power bus rail.
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@Chris,
You can power the APM on the receiver input power bus rails. If you are not planning on driving any servos during your testing, then you can leave jumper J1 off. I would not recommend powering the APM servo output power bus (J1 installed) with either the PM or a BEC on the APM receiver input power bus rail.
Regards,
TCIII ArduRover2 Developer