the end of this is ,opening any door killed radio power. turns out the constant 12v to the radio,key off,loaded down all 12v.
added a $5. relay to key on 12v that connected directly to battery.
ran separate rear spker. wires.
now ,the interior light is on when door is unlocked,before door is opened,the fuel gauge doesn't stick at 1/2 then directly to 1/4.
maxium amp power,full volume ,no power cutoff.

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72 250 CE-5spd-gone
79 280 CE
82 300TD
83 300 CD
83 380 SEC