Suggest U open the unit and double check where each wire goes...
1 wire is to 12V+
1 wire is ground & speaker ground
1 wire is left speaker +
1 wire is right speaker +
By following each wire internally will disclose its function, most crucial is the 12V+ and ground, the speaker +'s are easily reversed ..
Just my $0.02...
You never want to get the speaker wires "out of phase" or the + positive to the +positive on one speaker and the + positive to the - negative on the other speaker as you will have poor sound quality. When you do this one speaker will cancel out the other as one is "pushing" air and the other is "pulling" air (for lack of a better term). You will have little or less base. It's best to wire the speaker in phase or correct, positive to positive and negative to negative.
True...
Whenever the amplifiers has
separate ground leads for each channel speaker outputs...However in a (4) wire system, the amplifier's negative speaker output leads are
also chassis ground so its not possible to connect a speaker out of phase from the amplifier side only @ the speaker unit itself if its ground and positive leads are reversed.....
Just my $0.02...
Understand all of that
but DUFFMAN is trying to identify if those four (orange, white, blue, yellow) wires are positive and negative speaker wires. If they are? then there's a chance DUFFMAN could get one speaker out of phase. Getting both out of phase would not be a really big issue but one speaker out of phase is.
With what you say that the - negatives are grounded to the deck's chassis, then it should be easy for DUFFMAN to determine the - negative (ground/earth) wires with an Ohm/multimeter by putting each wire to the deck's chassis.........is that correct???
Mike