Where do i plug the 2 sets of RCA plugs that came with the metra harness to? . Im using the metra 70-1725 integration harness.



Do they go back here?



What are these for?



this is the HU:




Modified by thrty8street at 12:04 AM 6/2/2006

 

The RCA's on the harness get plugged into the front and rear preouts on the deck. Without seeing a wiring diagram of the deck, I'm going to have to assume that the green RCA's are a sub out; so you'll want to use the ones on the deck itself.

 

thanks alot man ill check the alpine manual to see which ones go where.

 

my friend has this exact same head unit which i wired up for him

i will back b18c on this one

 

if the adapter harness has 4 rca's then you use the ones that are directly on the radio itself. If the harness only has 2 then you will have to use the front output only. The only thing you will lose you front to rear fade capability, but who uses that anyway. The third set of rca on the radio is for subwoofer, it is on the green rca, do not use these

 

thanks! another question:

is it safe to wire the ground to the wiring harness or should i ground it to the car?

 

you can do either one.

but if you want the best ground i would sand a spot off and ground it yourself to the chassis

 

alright i just grounded it to the harness because i couldnt find a spot. I just pluged it in and its working good. thanks to everyone for helping

 

be careful with that radio I have the same one you may have to run your constant(yellow) and accessory(red) directly to the ignition harness. Upper model Alpines are known to act up when using factory radio power wires.

 

I've never heard of having to run switched off the ignition harness... Constant, yes... :shrugs:

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Makavelicybe &raquo;</TD></TR><TR><TD CLASS="quote">be careful with that radio I have the same one you may have to run your constant(yellow) and accessory(red) directly to the ignition harness. Upper model Alpines are known to act up when using factory radio power wires.</TD></TR></TABLE>LOL it has nothing to do with it being an Alpine, most of today's "high power" HU need more current then the 7.5A available at the oem radio harness constant power, and that is why you should wire the HU constant power, [yellow] directly to the batt., [just like you would any off board amp], you do not however need to wire the HUs acc., [red] to anything but the oem radio harness acc. power, as it is nothing more then a trigger or control lead for the HU, just like the amp control lead of an off board amp.

In this case the Alpines internal amp is not being used, [Bose system] the oem radio harness constant power will work just fine, in fact He may even be able to turn off the internal amp completely so it does not even draw "idle" current. 94