Alpine 9870 - Which is the Remote Wire Color?

[VROOMCP]

I need to know which wire is the one I need to plug into to wire the amp? Thanks,

[Mless5]

Usually blue. It will get ~12V when you turn on HU.

[VROOMCP]

Thanks. I always heard that its the blue wire, but after reading up i found out that its the blue and white wire. thanks.\