Turn on lead

Right now I just have an aftermarket head unit, amp, and subs in my Nissan Pathfinder.  I'm installing a second amp and 4 speakers this weekend.  Anyways, I know how to hook up everything in a 2 amp system except for the remote turn on lead.  Instead of running a second one from the front I can just splice the one I already have, correct?  I'm not really sure how to do this.  Does it involve adding a second wire in the middle of the one that's running? Or attaching a second one to the end?  Can someone please explain this to me?

Thanks

A remote wire is usually wired to a switch/relay inside the amplifier that if it receives a 5 volt signal or whatever it opens the gate and the amplifier can turn on.  I have used the same remote wire multiple amps without a problem.  Even if you ran a second wire, you still would have to splice into the remote/ign wire of the head unit twice, so why not do it in the trunk!

good luck

Craig

Mason,

you could either Splice it in like you're talking about, which is okay to do, hell a lot of installers do it on a two amp system...but the correct way is to use a relay...

here's a link: https://www.the12volt.com/relays/page5.asp#rtol

Jsut replace the word fan with amp....that's how it's done....

You can use a SPST relay for this application.  The SPDT has an extra pin which allows a connection between pin 30 and 87a when there is no power to the relay. (thus making the connection break if there is power supplied) If in fact power is supplied, pin 30 and pin 87 will have a connection.  So in reality, you should probably use a SPST relay for your needs.  The 5 pin is not needed.

This is your hookup with an SPST relay:

1. Pin 86 = (+) Remote turn on lead from head unit

Take care and hope this helps!