Help: 12V positive wire?

[Mudhorn]

Which wire is positive, green or white?
Sorry if my search skills are lacking, I couldn’t find an older post.

 

[BobsTrail]

It's only a guess. Get a $7 voltmeter from Harbor Freight. It can be used to check for connections tool.

 

[daytonaviolet]

I believe it’s the white one. Just try it, else swap

 

[Mudhorn]

Green is positive. I didn’t see the black stripe on the white wire at first.