I don't know but really, it won't matter in the least as long as you mate up the rear and front speakers in the same color code. If you decide the Red is neg in the rear, then it has to be negative in the front too.
http://www.modifiedlife.com/1988-toyota-tercel-car-stereo-radio-wiring-diagram/ Change the year in the link to your Tercel's year
try www.autozone.com
The car stereo wiring colors for a 1988 Cadillac El Dorado with Bose are gray for right front speaker positive. Light green for right front speaker negative. Dark green for audio rear speaker positive and brown for rear speaker negative.
Go here http://www.modifiedlife.com/1988-chevrolet-caprice-stereo-wiring-color-codes/
Behind the glovebox and the passenger side speaker.
Remove the covers from your 1988 Mercedes-Benz 300 speakers. Remove the speaker retaining screws. Remove the wiring harness from the back of the speakers.
probably a wiring short... half the 1988-1991 Toyota corollas still on the road seem to do that.
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