When I pull the spkrs out of my front doors, the wire leads to the spkr terminals come out part way and are two separate leads encased in a slim plastic sheath/protector. The one with the smaller spade terminal is the ground and goes to the matching smaller lug on the spkr. (All very simple but easy to get crossed up.)
Only simple radios/stereos built long ago have a single common ground for left and right channels...you must have the proper connections to the stereo unit for the +ve and ground for left and right channels or you can fry a modern unit. The spkr wiring on both our 240's has a connector on each side, above the underdash pad, which joins the stereo unit wiring to the door spkr leads on that side. Wire colors coming from the stereo for the spkrs are yellow, and gray, and white, and yellow/gray...something like that..can't remember for sure. You'll know when looking at them - just don't mess with the other pair of wires with an identical connector also going into the right door - power lock wiring.
Before installing the F. door spkrs, run the window fully up and down while looking in the spkr hole and you can see potential interference with the wires. Route wires accordingly, then place spkr in position and hold lightly by hand while running window through its complete range of travel and feeling for any contact.
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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