check your schematic, there is a switch wire that runs to the starter that, on my 87 turbo atleast, was ran between IM and the block. it was a black wire with a blue stripe on it, see if you have something like that and use a test light to verify it gets power only when key is turned to start.
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87 supra, 7MGTE, head gasket and turbo replaced, runs and boosts! fixing wiring odds and ends, then storage for a year basically...then comes big money cash in er, lookin for 500+ to the ground and a very sleek, sexy mkiii
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