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Update - Measuring circuit resistance from battery post to Start Signal wire was 0.2 Ohm. Measured by applying a Lamp and loading over this circuit determined a 1.35 ohm drop across the signal wire circuit. So in my case, the start-signal circuit does not appear to be an issue. Inspecting...

FYI - Both The Soarer UZZ3#/JZZ3# (Lexus SC400/SC300) and JZA80 utilise a 'Starter Relay' located in engine Bay, perhaps to reduce cable resistance and in cabin starter cable wire gauge. My JZA70 has the symptoms identified in this tread, and the apparent cause is start Wire resistance when...