Trying to install a new radio into my 95 toyota 4 runner but the wire colors in the car and ione ones on the radio don't match. how do i find out what wires to hook to what

If your truck still has the plugs from the stock radio you can buy a wiring adapter from walmart, if not you will have to test each one individually, black is always the ground red and yellow will be the power leads yellow is usually constant but test both with a test light or voltmeter with the key in the off position and the the on position to make sure. As for the speakers you will have to hook them up one at a time and make sure the sound is coming from the correct speaker. possitive and negative wires for each individual speaker will be the same color, but the negative will have a stripe runing down it. Hope this helps.