[Anchor2728]

Already have a 7pin connector and was thinking about splicing into 7 pin wiring for backup lights, to turn on alarm. Would this load cause any electrical issues with the computer.

 

[MikeR.]

You could also just tap into the 4 pin, or the tail lights.

 

[sanghill]

This is the easy way: Subpar Rearview Camera Quality Post #3.
I thought the alarm wasn't very loud, then I opened a window and it was better.
It is loud enough for shopping centers where you don't want to scare people.
If you are at a construction site you will want something a lot louder.

 

[Flybynightcru]

OMG, That would drive me insane!!! If I could disconnect them on my road tractors I would, but unfortunately they are required by Federal law on all commercial vehicles...😳😎

 

[SkipW]

OP, to answer your question, no, it would not cause any issues with the computer. The reverse light pin produces 12v (hot) whether or not you use it.