Ok so I've decided to upgrade the standard stereo on my 05 rr sc cause it just looks so dated ... bought a double din Alpine , bought all the adapter leads they recommend but I have no sound ? on my original stereo i have 3 multi plugs , the main one ,smaller one and one with 2 thick wires ( amp ?? ) but my wiring adapter only fits into the larger of the multiplug holes .( its powers up and does it its supposed to but no sound , to i need to tap into the Amp plug / is the speakers the other multi plug ?