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94 sa50 battery issues
Posted: Fri Oct 03, 2014 9:31 am
by Mystic
Anyone know a reason my battery could go dead overnight with no key in the ignition but charges when I drive it? Battery is new, about 2 weeks old. I'm thinking regulator/rectifier issues
Re: 94 sa50 battery issues
Posted: Fri Oct 03, 2014 9:36 am
by LMH
The battery has a bad cell, it happens.
Re: 94 sa50 battery issues
Posted: Fri Oct 03, 2014 3:46 pm
by 808EERPS48
idk if the rectifier regulator would cause a drain, it converts the dc to ac for your lights to run try check your grounds and stator wires:2thumbs:
Re: 94 sa50 battery issues
Posted: Fri Oct 03, 2014 7:02 pm
by mousewheels
I have found Honda Regulator/Rectifiers do fail in a manner which can slowly discharge the battery (over night, or over a couple days) to blown fuses, to melted wires (if the previous owner bypassed the fuse).
In a stock Honda scooter electrical system, the Rectifier/Regulator is the *only* component powered up with the ignition switch off. That is a tip off for dead battery issues, if the battery itself is known good.
A reverse polarity battery connection, or accidental reverse polarity jump start attempt have caused regulator failure. Good part is regulators are easy to troubleshoot, and inexpensive if required.
-- Easy tests --
1) "I want an immediate answer' --- Disconnect the battery + wire, and insert a multimeter set to DC Amps (start with 2A or above) between the battery + term and fused harness. With the ignition *OFF* there should be ZERO current.
2) Meter's loaned our, dead or gone missing? Charge the battery, then unplug the regulator. Party for a week <grin> then check for e-start functionality. If behavior is different than when the regulator/rectifier was in circuit, the regulator is bad.