Could my coil drain my battery, why?

Rook32432

XS650 Member
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Location
Kennesaw Georgia
*Update*
Battery charged overnight. 12.7v
New coil installed. 4.5 ohm.
Charging system still disconnected.
Key on.
9v drop with just coil wired.
10v drop with just headlight wired.
2v drop with just turns wired.

……Going to exchange for a new battery.
 
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