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R/R voltages

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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Hi!

I own a 1981 GSX 750. I had the stator rewound and I relaced the R/R three years ago. The battery is one year old.

I was riding the other day and when I slowed down for a stop I noticed that the main fuse had burned. Ofcourse the battery was empty at this point. I relaced the fuse and cleaned the fusebox connections which weren't in very good shape. The fuse has not burned after that.

I naturally also started suspecting a fault in the charging system so just to make sure I ran the faultfinding tests found on privious threads and the faultfinding chart.

Using the diode test mode I got 0.53V - 0.57V and infinite from the right spots, ok.

Then I swithed to the ohmmeter mode and put the red lead to the red output wire and the black lead on each of the yellow wires. I measured 1276, 1313 and 1410 ohms.

Then I put the black lead on the black output wire and the red lead on each of the yellow wires and measured 1386, 1404 and 1405 ohms. Is this right?

I was lucky to have a new R/R so I measured it as well. It is giving totally different values. The new one is giving 0.13V and 240 ohms were the old one is giving about 0.55V and about 1400 ohms. How is this possible. Did the dealer sell me a wrong R/R?

The charging voltage is abou 14.3V.

Sorry for the long post but I would be very greatful if someone could help me.

Thanks in advance!
 
I would think that if you are getting a volatage of 14.3 volts, that your reg/rect is functioning normally.

There are lots of things that can cause a blown fuse. Check to see that your battery and starter solenoid +12v connections are adequately insulated to prevent accidental shorts to ground.

It is possible that there was an intermittent short in any of the circuits on the bike. it does not have to be related to the charging system at all. Any thing that caused even a momentary short to ground will blow the fuse, without causing any other damage. That is the reason there is a fuse.

For example, I was working on my bike last week, and I accidentally touched a positive wire to the frame, it caused a tiny spark, which lasted about 1/100 second. I found that my fuse had blown, as it was designed to. I also found that the previous owner had put a 30Amp fuse in instead of a 15A fuse, as designed.

Matt D
 
Fuses also fail because of age and vibration. It is not carved in stone that the fuse failure was caused by an electrical incident at all.
 
Thanks for the response! I am sure the reason for the fuse blowing was bad connections in the fuse box or the fuse itself was bad. After cleaning the connection the new fuse has not blown.


Thanks and cheers.
 
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