I am installing a new CD-mp3 player in a 1992 car. It replaces an old radio-tape player. I managed to find the wiring code via Google, and I have connected the new CD player to the car's original plastic plugs (wire harness), using a multimeter to confirm the two 12 v leads (ACC/IGN, and Battery) and the ground wire. So far, so good.
My question is about the 12 v lead marked 'battery'. (This is not the ACC/IGN 12v lead that becomes live when the ignition key is turned.) The problem is that the "continuous 12v battery lead" for the old tape player is rated at only 5 amps, while the new CD-mp3 player is rated 15 amps. The new 15A wire certainly is thicker than the car's original wiring to the battery.
Now I assume that I do not actually connect a wire (with 15A fuse) straight to the battery so my question is where do I tap into continuous 12v, if not direct to the battery?