Huge voltage drop with ignition turned on

wmeadow

XS400 New Member
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Hey guys - first post here, veteran mechanic but a XS400 newbie.

Just picked up a non-running 1980 XS400 from a buddy. First problem I noticed is that with the ignition turned on, the battery voltage drops way down. Also, with the switch on, the resistance between the + and - terminals (with the battery removed) drops to just about 0.

The resistance for the stator wires is about 1ohm, and the field coil wires are showing 4.5ohms. What should I check next?
 
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