AT-2326-2 amfm radio

[Denis]

I am looking for information about an AM FM radio removed from a 1978 Toyota Corolla. Specifically, I need the wiring diagrams to identify the positive, negative, and speaker configurations of the wires that extend from the back side of the radio. This radio is a FUJITSU TEN LIMITED (Japan) AM FM radio Model Number AT-2326-2 Serial Number 1703157. The paper tag also has a Toyota Part Number 86120-12220. The front face has 2 AM pre select buttons and 3 FM pre select buttons. The speaker balance knob is front left suggesting the unit is an OEM stereo unit. Thanks for any information.