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I learned a few things working on our '90 244's lights today.
Backup lights "hot" wire is black. It arrives via main harness on left side - that wire goes to the connector on drivers side taillight set. On the connector, the adjacent black wire picks up the current by contacting the same terminal on the flex circuit board. That adjacent wire goes over to the passenger side of the car to run the right backup light.
Did you check is the backup light switch? I can't recall if you wrote that you did or not. If auto tranny, it's in the shifter housing. Pull the 2 scerws at front and slide housing cover over to the side. There are two contacts for park + neutral to allow the starter to work, and one contact for Reverse to activate the backup lights. Switch or wiring in that area could be shorted out. This is a "standard" type switch - hot power comes in, and if the switch is "on" hot power is sent out to the backup lights, where it goes to ground via the bulb. Probably a black wire like the one at the taillights.
Did you make sure that no other lights are on when you see the backup light on? There could be a short circuit from the taillights (if you like to leave them on), shorting into the backup light wire. Of course it shouldn't do that, but bare wires making contact could have that effect.
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Sven: '89 245, IPD sways, electric rad. fan conversion, e-codes, 28+ mpg - auto tranny. 850 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).
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