au2 ghia sub and amp

eb falcon gl · 27-01-2012, 06:03 PM

hi, i recently had a new alpine headunit installed into my au2 fairmont ghia with stock speakers, sub and amp.

But i think there is something up with the wiring with the sub, amp and rear speakers. Its like they are all connected to the one thing. eg when i change the settings on the headunit like turn off the sub it will stay on.
however if I unplug the rca connector at the amp the sub goes off, but the rear speakers stay on.

Has anyone got any ideas on what to check or how it should be wired up?

thanks for the help

block58 · 27-01-2012, 06:32 PM

There are 2 factory harnesses you've got to use: The big one all your speakers and stuff connect to, and the smaller black one which contains wiring for power to the amp, and the sub (which is all the amp powers)

Take a look at STEP 6 in http://fordforums.com.au/vbportal/mo...article&id=725, which should explain how to do it.

I've recently installed a JVC unit into my 75th Ghia and got the sub working perfectly with that guide

eb falcon gl · 27-01-2012, 07:35 PM

thanks for the reply. it seems to wired as that diagram. Maybe the amp cannot be turned off hence why the sub stays on and can only be turned up or down but not completely off maybe?

Ride · 27-01-2012, 09:06 PM

Quote:

Originally Posted by eb falcon gl

thanks for the reply. it seems to wired as that diagram. Maybe the amp cannot be turned off hence why the sub stays on and can only be turned up or down but not completely off maybe?

The control wire is the wire that gives the signal to turn off and on, if you haven't correct wired that one you will experience what you are now going through. I also followed the same guide when I used my factory amp for a short while and it worked fine. Also make sure that the RCA for the sub is not plugged into your rear speakers RCA.

eb falcon gl · 27-01-2012, 10:20 PM

thanks ride i checked the rca plug and i had it in the wrong plug and that has fixed it

Ride · 27-01-2012, 10:24 PM

No worries buddy. Make sure you get some photos of your Ghia up pronto, always a soft spot for them (mine is looking a bit sad in my driveway)

eb falcon gl · 27-01-2012, 10:47 PM

I have been wanting to, but i want to get the side door mould put back on after it fell off