Broken Frostheater plug, remind me which wire is which?

sqdude

Veteran Member
Joined
Feb 6, 2007
Location
Eugene, Oregon
TDI
2000 Jetta TDI
I already spliced/replaced the heater cable once, and now the replacement 3-prong plug itself has fallen apart. In looking at the wires again, there is an obvious green ground/neutral wire, but the other two are both black. How do I determine which one is the power wire? Thanks!
 
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