Question about Mazda MX-5 Miata
98% of the time that's a corroded ground wire for the headlights and I've dealt with it several times. Look under your brake booster and you'll see a flat white rectangular plastic case with about 6 black wires running into it. It's fastened with a #8 bolt straight down into the car chassis. Because it's sitting on the flat shelf it gets wet and once the connectors get corroded, it creates exactly the problem you describe.
It can be opened up and the wires cleaned. There's a good YouTube video that shows how to clean corroded and oxidized wiring in cars:
Posted on Mar 10, 2015
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Posted on Jan 02, 2017
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