It sounds like a wiring problem but I have a manual transmission. Wait for a wiring guru to write. Check the fuse box with a DVOM check at the relays, and the different places at the fuses. Check both volts and ohms it might tell if there is a lot of resistance. Also check by wiggling the different wires at the lights it might show a open some where. I know there has to be someone here that can diagnose this problem. See if Mrnickeye writes he is a geniuses with the supra's.
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