Motorcycle Repair: Charging system, regulator rectifier, battery tenders

Question
My 1980 Goldwing puts out 13 to 14 volts at 3,000 rpm however at idle it only puts out 10 to 12 volts.I did replace the regulator/rectifier and it still does the same thing.Why will it not hold constant voltage at any engine speed? Thank you

Answer
Hi Schuyler,

The 1980 Goldwing does not charge the battery at idle.
It is designed to start charging at 1800 RPM.
It is normal to have only 13-14 volts maximum on these.

The stator (alternator) coils output more AC voltage as
the engine speed increases. I believe the output
may be a little higher on the 1982 and up Goldwings.

Other than installing a higher output aftermarket
stator there is no cure for the stock system.

Motorcycles typically have lower output charging systems.
This may be due to cost,weight or heat issues.
Many people resort to battery tenders or small chargers
to keep the battery in peak condition.

If you notice very great voltage variations it may be
poor stator to regulator connections, loose battery cables,
poor frame or regulator grounds or faulty battery cells.

The battery should keep voltage reasonably steady if it is strong
but your voltage will drop under 1800 RPM by design. (ask honda):)


Good luck!
Wayne S.
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