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The problem is the strands are usually covered in glue. Because they are also all connected together at both ends that makes testing an individual wire harder.
IMHO the best way to test is to fog the glass, then turn on the heater. Perhaps put it in a room that's cool with ac, then blow steam from a pot over it.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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