Author Topic: 1983 getting 11.96 volts  (Read 453 times)

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
1983 getting 11.96 volts
« on: December 30, 2019, 05:16:34 PM »
Hi - I have a new roadstercycle mosfet regulator/rectifier. Iím running an Eastern Beaver PC-8 fuse box. I added a little LED voltage flasher. It attaches to my headlight positive and the ground runs to the ground cable of the battery. The flashing volt reader was flashing red 3 times in bursts. That means power is low. I have a new Yuasa AGM battery.

I checked the power at the battery terminals at 2000 RPM. 11.96 volts!!! What and where should I check next? Is it possible for the alternator going? If so, how do I check it?

BTW, I tried to do a search on the forum. Didnít work so well.

Regards,
Bill

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #1 on: December 31, 2019, 03:55:19 AM »
ďSearchĒ brought this up from Rick G:
ďA properly functioning Vision stator should put out 50 to 55 VAC. Measure  across any two stator leads  in succession.ď
Iíll have to figure out how to do that.

fret not

  • Contributing Member
  • Visionary Expert
  • ****
  • Posts: 2245
  • Mike Lewis - Grass Valley CA
    • Michael Lewis Instruments
Re: 1983 getting 11.96 volts
« Reply #2 on: December 31, 2019, 04:05:19 AM »
With the ignition off what voltage does your battery read?  Have you checked the continuity readings on the 3 wires coming out of the stator?  Check them with the motor off, then check voltage with it running.  The technical information can be found in a link on the opening page: in the block of blue bars in the lower left side of the page, "Dave's Ignition FAQ".  You will find what you need there.
Retired, on the downhill slide. . . . . . . . still feels like going uphill!

MikeScoot

  • ROV Full Member
  • ***
  • Posts: 90
  • NSW/Qld. border, Australialand
Re: 1983 getting 11.96 volts
« Reply #3 on: December 31, 2019, 05:34:09 AM »
Might also be a good idea to check the calibration of the multimeter. Oslo, what is the battery voltage when the bike is not running compared to when it IS running?

Oops, Fret mentioned that.
Luther had his dream,
But I've got my Vision.
His got him into strife,
Mine just takes me fishin'.

Prophet Of Doom

  • Contributing Member
  • Visionary Grand Master
  • ****
  • Posts: 2668
  • The really perverted one amongst us
Re: 1983 getting 11.96 volts
« Reply #4 on: December 31, 2019, 06:31:31 AM »

Ken Williams

  • ROV Full Member
  • ***
  • Posts: 76
  • I love YaBB 1G - SP1!
Re: 1983 getting 11.96 volts
« Reply #5 on: December 31, 2019, 09:15:03 AM »
The Rick G voltage measurement is made with engine running and stator wires disconnected from the regulator/rectifier.  If you make these measurements, also measure the voltage from stator lead to ground.  Significant voltage there indicates the stator wiring is shorted to ground.  Generally, stator serviceability can be determined with stator lead to lead and lead to ground resistance measurements, engine not running. 

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #6 on: January 01, 2020, 03:47:03 PM »
Here's my first test. The Power Probe tells me polarity and if there is current, it will show the voltage. It is connected to the battery's terminals. These three yellow wires at the Reg/Rectifier are the 3 wires coming off the stator. Notice each of the three read as (-), going to a ground. The motor is not running. Has my stator gone to ground?


WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #7 on: January 01, 2020, 04:25:37 PM »
Second test: I disconnected the yellow stator wires from the Reg/Rect. The red probe is on the 3 yellow wires at the gang plug. The black probe is on the NEG battery terminal. The setting on the meter is at 200 ohm. I'm getting continuity on the ohm meter.

fret not

  • Contributing Member
  • Visionary Expert
  • ****
  • Posts: 2245
  • Mike Lewis - Grass Valley CA
    • Michael Lewis Instruments
Re: 1983 getting 11.96 volts
« Reply #8 on: January 01, 2020, 05:11:33 PM »
One point toward clarity is to make sure your battery is well charged before testing anything.  You reported the battery is new AGM type, but is it charged fully?  Once you determine the battery is charged then proceed with the other tests.
Retired, on the downhill slide. . . . . . . . still feels like going uphill!

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #9 on: January 01, 2020, 05:56:39 PM »
I put in a new Yuasa AGM. Charged by Nocco. Iíll continue in the AM.
Thanks, for helping!

Ken Williams

  • ROV Full Member
  • ***
  • Posts: 76
  • I love YaBB 1G - SP1!
Re: 1983 getting 11.96 volts
« Reply #10 on: January 01, 2020, 06:23:34 PM »
It appears that second test is a measurement of stator phase to ground resistance with stator not connected to the reg/rect.  If so, the value of 7 ohms indicates the stator is shorted to ground and must be rewound or replaced. 

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #11 on: January 03, 2020, 08:37:31 PM »
Next week a new stator will be arriving. It was baked and fried.

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #12 on: January 10, 2020, 04:15:59 PM »
I got an Africa Twin stator from an eBay seller. It fits!

injuhneer

  • ROV Full Member
  • ***
  • Posts: 94
  • Mike O. - SE AZ, USA
    • OOTFAB
Re: 1983 getting 11.96 volts
« Reply #13 on: January 11, 2020, 04:16:55 PM »
I got an Africa Twin stator from an eBay seller. It fits!

What model year(s)? Which seller? Does the rotor fit over the new stator?
« Last Edit: January 11, 2020, 06:05:45 PM by injuhneer »
- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #14 on: January 11, 2020, 05:46:03 PM »
It fits. I still have to get everything attached and wired up again the the RR. Weíll see if it rotates when I can start up.

injuhneer

  • ROV Full Member
  • ***
  • Posts: 94
  • Mike O. - SE AZ, USA
    • OOTFAB
Re: 1983 getting 11.96 volts
« Reply #15 on: January 15, 2020, 10:42:47 AM »
Any update? If this works/fits I need to order one for my Viz.
- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #16 on: January 15, 2020, 11:29:41 AM »
Any update? If this works/fits I need to order one for my Viz.

Started and warmed up two days ago so I could check the oil level. Iíll ride shortly. Pics to follow.

injuhneer

  • ROV Full Member
  • ***
  • Posts: 94
  • Mike O. - SE AZ, USA
    • OOTFAB
Re: 1983 getting 11.96 volts
« Reply #17 on: January 16, 2020, 10:50:45 AM »
What model of Africa Twin?
- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #18 on: January 18, 2020, 11:41:17 AM »
« Last Edit: January 18, 2020, 11:48:32 AM by WGuaire »

WGuaire

  • Contributing Member
  • ROV Full Member
  • ****
  • Posts: 60
  • Riders of Vision .net
Re: 1983 getting 11.96 volts
« Reply #19 on: January 18, 2020, 11:47:02 AM »
My parts guy never got back to me about a replacement gasket. I used Yamabond 4 instead. I squeezed a blob onto some cardboard and applied the goo onto the gasket surface using popsicle sticks and cotton swabs, keeping it thin. At my local variety store I bought some small corks that kept the bond out of the screw holes.