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How old's the battery? They have a date on them. Batteries have a finite life. 4-5 years max, if you're lucky. Most go about 3-4. If it won't take, and hold, a charge after 3 - 4 hours, it's likely toast. But, be sure to check the voltage coming out of the regulator. A bad regulator can kill a battery prematurely.
You should see at least 12.5-13v coming out of the regulator at idle, and 14-15v at 1,500-2000+ rpm. If not, then test downstream at the coil for the same thing to isolate whether it's the reg or the coil.
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Present:
'94 900SS|SP #143
'98 Yamaha R1
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