Does it matter which wire from the detector goes to ground or (+)?

(One wire from the detector is all black and the other is black with a white stripe)

Thanks

ps I checked the write ups and they didn't specify

 

yes it does matter, the solid black wire is ground ( - ) and the wire with a white strip is ( + )

 

Thanks!

Thats how I did it. I guessed right!

 

guessing with wires is not a good thing..... got lucky.

fyi- when it comes to wires, solid black almost always indicates ground.