Should you switch off the generator when removing a remote to attach tens cable to do a scan? I always stop the generator before removing the remote but I don’t switch it off when swapping accessories. 

No there is no need to turn off the generator to switch between accessories.
If you are referring to the GX GDO scan remember to connect the tens cable directly to the generator and not through the boost. The lights on the boost could add unwanted noise to the scan.

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