I couldn't find a diagram specifically for the 95 celica gt?? I found one for the st205, but there is 2 grounds?? 1.) sgnd - brown color NO. 12 on diagram 2.) egnd - thick white with blk stripe NO. 11 on diagram I found an st205 wiring diagram but wasn't sure if it applies on st204 chassis. which ground if I'm connecting an aftermarket radio?? previous owner butchered the old wiring and plug so I'm soldering the wires to the amp wiring harness.

Grounds don't really matter, there are all going to the same place, the battery.

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I'm trying to do this right though, previous owner has spaghetti wires that causes humming noise and got it shorted to a power wire that causes it to stay on and kill the battery.



Another question is which one is the ACC wire, cause it seems like I can't get the radio to power on, It does have battery voltage so I'm guessing I grabbed the wrong wire for the ACC??

Rotate the key to ACC and check for +12, simple.
You should have constant power on, going to the radio, because it will loose all it's settings otherwise.

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Cool, i'll try this. thanks for the help...