Thraxxface
XS650 Enthusiast
My assumption is that red is hot and green is ground on the new harness. OEM states that green is hot and black is ground. So those would be correct.
-
Enjoy XS650.com? Consider making a donation to help support the site.
XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going.
-
It's time to vote for the bikes you want to see in the 2025 XS650 Calendar! Vote here!
79’ 650 New Reg/Rec Causing Electrical Issues?
- Thread starter Thraxxface
- Start date
OEM, green is field excitation voltage.
Thraxxface
XS650 Enthusiast
Are we not saying the same thing here?
Mr 5 T is rarely Wrong Grounded low where you have red hot
If I get this right
If I get this right
Maybe. But field excitation voltage is the technically correct name for the green wire to the rotor.
Thraxxface
XS650 Enthusiast
Lol Shut up, man. You guys suck. You may be onto something here. I’m tracing back my harness now. I think red is supposed to be ground on the new stator harness.
Thraxxface
XS650 Enthusiast
The harness shows:
3 whites connecting correctly
Another white? Going to OEM light brown
Green connecting to OEM green correctly
Red connecting to OEM black
I think I may have found part of the problem
The red wire connected to your inner brush must be a ground wire. If it was "hot", it would create a short because that inner brush is grounded full time to the stator housing by it's 3 mounting screws. If you look at the back of the housing, you can plainly see this. The outer brush wire terminal is isolated from the housing because it is fed power .....
That would be below par so to speak to replace black ground with red
Not a mistake --- A sabotage
Perhaps disconnect at the brushes and Measure actual Voltage on Red and Green
Wires
Not a mistake --- A sabotage
Perhaps disconnect at the brushes and Measure actual Voltage on Red and Green
Wires
Thraxxface
XS650 Enthusiast
#chinesegarbage
Thraxxface
XS650 Enthusiast
If the two wires were mismatched what would be the issues that would follow? Would it just not charge? I just removed the safety relay and bypassed the harness. The lights are running with actual brightness and the engine started almost immediately. I know now that was part of the issue.
Not knowing the wiring and not knowing the setup now
I would guess the regulator part in that combo is Toasted .. History
I hope I am wrong but be careful plugging it in wrong.
Does it regulate and charge measured across battery ?
Again please check before connect and testing
I would guess the regulator part in that combo is Toasted .. History
I hope I am wrong but be careful plugging it in wrong.
Does it regulate and charge measured across battery ?
Again please check before connect and testing
Thraxxface
XS650 Enthusiast
It runs at 12.08. When the reg isn’t plugged in to the battery it reads .8
Not sure about what is connected .But if it is all there .The Motorcycle is not charging
14 - 14.5 Volt ish is the correct value.
Circuit analysis to perform ..Charging section
You can find service manuals on line.
Do you have the stock Mechanical Regulator .and Rectifier there in some box
Thraxxface
XS650 Enthusiast
My guess is that the alternator is fried. I’m getting 1V out of the yellow wire when I know there should be 6V. That’s a direct line that crosses nothing else so I know nothing else is affecting that wire.
Thraxxface
XS650 Enthusiast
I do have the stock rectifier. Regulator caught fire and was replaced. I know it’s not the reg/rec anymore. The alternator was on its way out for a few weeks now. I was just hoping I could slow the bleed.
Progress
In a service manual there are instructions for fault finding on alternator stater and rotor
Usually the rotor 8 times or so more likely Resistance between slip rings going off
Thraxxface
XS650 Enthusiast
I have 6 Ohms when I touch the slip rings together
The stator looks to b for an 80 and later. Mike's sells their stater that has the mounting holes for the 80-84 Factory TCI pickup.
IF....your bike has points then the wiring on the stator needs to b sorted as per 5twins.
MikesXS's instructions to wire up the 70-79 Reg/rect are for an 80 and later model XS with the factory Electronic ignition......NOT..for a points model.
mikesXS instructions for 70-79 Reg/Rect
THIS IS WRONG FOR 70-79 REG/RECT
A 70-79 points model Reg/rect should b wired up as per the instructions in the link I posted in the previous post and quoted post
Others have been discussing your stator, You need to identify the stator and the brush wiring so it works with the reg/rect in my link
Last edited:
