A quick search shows that "combination meter" means your dash display (speedo, tach). It sure looks like leakage through the diode pairs, in the dash display. They've got some bizarro bridge rectifier deal going on there. There wouldn't be enough current to light up an incandescent lamp, but diodes are a different story. Like I said adding a power diode, or a whopping big power resistor, would likely do the job.
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