yes a 12v constant is a wire that has 12 volts even with the ignition off, you should not have to run a new wire the existing stereo should have one for station memory. with the ignition off test all wires on the stereo connector, only one should have power.
For me the reason the clock and stereo were resetting was because they were losing all power from the battery. The battery was dead. maybe your cables need to be cleaned or there is a loose connection.
Bad wiring connection or internal wiring connection in the stereo
You sound card should have a audio in port.
You may have to disconnect and recharge your car battery for your car stereo to work again.
connect the positive and negative to the stereo
An iPod can be connected to a stereo system for the purpose of playing music stored on the iPod with the quality of a stereo system. An iPod can be connected to a stereo either through a dock, or with the headphone jack on the iPod connected to the Aux In port of the stereo.
I follow the following procedure:Visual inspection for breaks, corrosion, heat damage, kinks and damage to the connecting endsRemove the battery end and check on the connecting surfaces on the cable and batter and if applicable the connecting boltIf I suspect and hidden problem I take a Volt meter (Multy Meter and measure battery voltage at the battery terminals with a considerable load on the battery (starter if Possible), not the connectors or connecting bolts if at all possible. Then I check at the Starter stud under the same load. There should be less than .2 volts difference in the two readings.If the problem is to another load (stereo, head lights etc) I check the same wayjust using the wire that runs to that item and that item to provide the load for testing.
If your connecting a stereo, it's always best to ground directly to the negative side of the battery: however you can connect to a ground under the dash also. Some autos have a ground block at the fuse panel that can also be used but you will need a spade connector. your cars body is the ground.connect the stereo ground to a metal part of the car,leave the battery connected to a ground,engine should also be connected to a ground
No.
yes, it is possible
did your old battery die because the alternator has a fault? if so your new battery may be flat, check cranking voltage at the battery if you can. if you don't have a volt meter see what happens if you turn on the head lights, stereo, heater fan etc at the same time, are the lights bright (battery ok) or dull (battery flat) other possibilities are a bad wiring connection, bad engine earth connection or faulty starter.
using a/v cables and connecting them color coordinatingly.