radio harness question

[mjmendoza]

im installing a sub in my 87 supra and i have a stock head unit from a 2000 corolla already installed. I ran into a problem when i had to install a little modulator that converts my stereo from low to high (the guy at the shop told me i needed it). i dont know which wire is positive and which wires are negative. can someone please help thanks. or if you know where a wiring diagram is that shows all the positive and negative for left and right speakers are. thanks

 

[mjmendoza]

the modulator thing is for only because the HU doesnt have a RCA output

 

[mjmendoza]

does anyone one know what color the remote wire is on a stock HU? or on the radio harness?

 

[3p141592654]

Note really sure what you want, but attached is the pinout of the 2000+ Toyota External Amplifier Connectors