cars remote wire not working

[juicyjayocean]

The problem isnt from the head unit to the amp but from the to the head unit my radio wont turn on unless i hook it uo to the constant and its getting rather annoying does any have any idea what might be causing this because its got me stumped

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[big scott]

blown fuse.

 

[Jepalan]

What make & model car and head unit?

Is this a new install, or was it working and then just stopped?