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73 240Z Heater wiring - is this red wire needed?

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Replacing my stock fan with a Honda Civic fan one.  So far not working but  I have a red wire (shown in picture) that I can not find a location to plug back into.  It wasn't plugged into anything when I took it apart.   Could be the reason why my stock fan wasn't working in the first place along with the heater assembly lights.  The map light works as it is connect to different wiring harness.   Is this red wire used for power and if so where does it plug into, I can't seem to find it's partner unless it is a blue wire, if so which one?


Any help would be appreciated.

Thank you,

Heater Fan Electrical Wiring1b.jpg

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