I have a 1993 thunderbird with the premium sound system, so i was wondering can i use the same factory cables (ground, p. connect and battery wire) from the factory amplifier for my new amp?
THE wires to the factory deck are chincy at best. i would at a bare min. run a new power wire to the battery for your amp, and a nice clean ground from the new amp the the chassis some where.
I'm running with an aftermarket amp on the factory wires. The REM cable from the deck is in the trunk and I'm using the same wires that power for the amps came through. I ran it at full volume for about 20 minutes and checked the temp and they were fine. I was worried about it initially but it was fine, no heating of the wires. Albeit I'm just running a 300 watt MOSFET amp from Walmart... I'll attach a pic of my setup.