It does sound like the flasher unit, though I've never heard of one doing that Based on how they're constructed it's entirely possible. It's basically a relay with a thermal element and a bi-metallic reed. I could see one of those going bonkers.

I don't know offhand if it's behind the instrument cluster, but no worries because the instrument cluster is very easy to remove. You can make yourself the tools to remove it from a coathanger, just search here on the forum.

Good luck.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
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