Audio Systems: car audio wiring, kenwood amp, rca outputs

Question
I see where you are going, it would be more easier to just get new amp with the RCA jacks and all but this Kenwood amp is/was a really good amp-200 watt 4-channel amp, I hate to spend money on new one.  Yes, it has the 8 gauge power and ground that go straight to battery, but yes it only has the DIN plug hookup and speaker leads. Looks like the only thing would be to do like you said and tie into the DIN cable power portion with a separate on/off switch?
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Followup To

Question -
I have a older model Kenwood radio and AMP.  The output and input connections for these 2 units are 8 slot "DIN" plugs. The DIN plug provided all audio and power to AMP from radio.  I have since upgraded to a radio that has RCA outputs. Question- Where can I find a RCA to DIN adapter and how will i be able to turn on AMP since the remote power was through older radio (turn radio on and amp turned on).

Answer -
Seems like they were a matching set.  So let me get this straight, the amp has a regular power line to the battery, like 8 gauge red and it has a ground wire like 8 gauge black?  it also has speaker connections and an 8 din plug but no rca connections and no remote turn on lead? If there are no power connections at all like I was saying and it only has speaker connections and the 8 din then i wouldn’t even bother with trying to make it work. this would suggest that its a very low power amp and your new unit would be just as powerful.  If it has the power lines then proceed.  If you have the old cd player about all you can do is hook it up and cut the 8 din wire and use a meter to probe each of the 8 wires inside. they should all be color coded and one should provide 12 volts when the unit is on this wire would go to your new cd players remote wire.  
If you get this far let me know the next part is more complicated. and as I said before if there are no power lines to the amp then there is no point to using it.


Answer
well what I'm saying is that if it does have the separate power lines then it may be worth trying to get it to work.  You are saying it does so let's proceed.  as for a separate switch to turn it on, no you don’t need that.  Do you have the old Kenwood radio that went with this and does it work?  If so please follow my directions and cut the wire with the wire unplugged at both ends.  Cut it about 6 inches or more from the cd player end.  Leave enough so that there's still plenty of length left to reach the new cd player and get to the amp. connect the wire to the back of the old Kenwood unit and attach a meter to a wire, attach the negative of the meter to the negative going to the Kenwood unit and set the meter where it would read 12 volts dc.  turn the Kenwood unit on and when you find the right wire it will show approx. 12 volts on the meter only when you turn the Kenwood unit on.  lets say that this wire is blue and it's the only blue wire in the 8 din wire.  you would take the blue wire in the din plug going to the amp and connect it to the wire usually labeled "remote" on your NEW cd player. this will trigger the Kenwood amp to turn on like the old unit did.
Like I said the rest takes a little more work so let me know if you get this far.  I'm assuming the Kenwood amp has some sort of light that goes on when the old unit triggered it to turn on so look for that to know that it worked when you hook it up to the new cd player.