Voltage is irrelevant, it's current that blows a fuse.
by Mr Wednesday (2012-12-29 21:15:52)

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  In reply to: Yes, we tried the old thermostat. And a 3rd to be safe.  posted by Papa November

Your car is only a 12 V power supply, but it has lots of fuses and an electrical system that can handle some pretty serious current.

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