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Charging troubleshooting

  • Thread starter Thread starter Thomas Kenny
  • Start date Start date
T

Thomas Kenny

Guest
1984 GS550ES Good battery

I just replaced the OEM Regulator/Rectifier with a new one about two months ago. I went to start my bike today and the battery was flat. I charged the battery and the bike started right up. I checked the voltage at the battery and am only getting 12 volts between 1000 and 5000 rpm. Where would you start your troubleshooting process and how would you progress.

Thanks much, Gizmo
 
Assuming you have a good/newer battery and clean connections. There are only two components in the charging system, the stator and the R/R.
Keeping it simple.................. Unplug the three yellow stator wires from the R/R. With the bike running at 5k rpm check the AC AC voltage between each of the three stator legs (yellow wires) on the stator. Check voltage between wire 1,2 then wires 1,3 then wires 2,3. You should see 80 volts AC if the stator output is correct. If the stator is good, the only thing left is the R/R for the fault. Next, reconnect the stator yellow wires to the R/R as they were. Run the bike at 5k rpm and check DC voltage on the R/R red + and black - DC output wires with the wires connected to the battery terminals as they normally are. You should see about 14 volts at that rpm.
Basically, if you have a good battery, your connections are clean, and the stator is producing 80 volts on each leg at 5k rpm, the R/R is faulty.

Earl
 
Well, no, you would not know that without checking stator output. You can have a good stator and still get nothing to the battery because of a fried R/R or bad connections.

Earl


tconroy said:
Your stator is toast.i just went thru this myself.It cost me 113bucks from dennis kirk and was shipped to me in 2 days with no shipping charges.
Click to expand...
 
According to the stator papers,I've got a bad positive wire(red from pos battery to R/R.) Wire is approx 16 inches long. Can't find where it's bad. I'm waiting on a R/R from Duaneage and will start replacing parts until I figure it out. I had asked for help and the only response was I need to understand Ohm's Law if I want to fix my charging system.:(
 
earlfor said:
Well, no, you would not know that without checking stator output. You can have a good stator and still get nothing to the battery because of a fried R/R or bad connections.

Earl
Click to expand...

Sorry, I meant his r/r is probably fried.sometimes I type before I think! He still need to do the stator papers check list.
 
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