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Author Topic: 79 XS750 Stator  (Read 1602 times)

Offline Sonreir

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Re: 79 XS750 Stator
« Reply #40 on: Jun 11, 2019, 15:57:49 »
Without having the black wire from the R/R connected to anything?
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Offline Garc

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Re: 79 XS750 Stator
« Reply #41 on: Jun 11, 2019, 22:08:15 »
Without having the black wire from the R/R connected to anything?

No sir, if black is disconnected no voltage in either white/green loose with plug red +12V/green ground and verified <.1 resistance.  Battery is 12.5~13.0 static.

« Last Edit: Jun 11, 2019, 22:13:01 by Garc »
XS 750 Triple Shaftjacker

Offline Garc

  • Posts: 61
Re: 79 XS750 Stator
« Reply #42 on: Jun 11, 2019, 22:40:13 »
That loose green has direct continuity to chassis ground, that can’t be right from your diagram.

In fact I just checked every terminal on the entire R/R and they all have some sort of continuity through each other.
« Last Edit: Jun 11, 2019, 23:34:02 by Garc »
XS 750 Triple Shaftjacker

Offline Sonreir

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Re: 79 XS750 Stator
« Reply #43 on: Jun 12, 2019, 10:47:17 »
I've gotten a bit lost and I'm having a hard time picturing what's going on. OK if we reboot?

When you hook up the R/R according to the diagram, things are not working, correct?

If so, leave everything connected, turn on the key, and check for voltage on both wires going to the field coil (either green and brown and green and black, depending on your year). Please report back with the DC voltage readings you're getting.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline crazypj

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Re: 79 XS750 Stator
« Reply #44 on: Jun 12, 2019, 14:49:10 »
Have you tested wiring harness for continuity? Yamaha were notorious for having bundles of wires crimped together inside harness, one could easily have broken after 35~40 yrs. The XS wasn't as bad as the smaller bikes, they often needed replacement harnesses before they could be sold (un-crate, put a battery on it, do a warranty claim  ::) ) The worst were the intermittent faults, may work for months then just stop. Spent many hours fault finding on Yamaha's (Suzuki's were easy, almost always blown R/R, and stator after owner fitted a new battery without testing anything)
'you can take my word for it or argue until you find out I'm right'
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CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
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Offline Garc

  • Posts: 61
Re: 79 XS750 Stator
« Reply #45 on: Jun 12, 2019, 17:17:06 »
Have you tested wiring harness for continuity? Yamaha were notorious for having bundles of wires crimped together inside harness, one could easily have broken after 35~40 yrs. The XS wasn't as bad as the smaller bikes, they often needed replacement harnesses before they could be sold (un-crate, put a battery on it, do a warranty claim  ::) ) The worst were the intermittent faults, may work for months then just stop. Spent many hours fault finding on Yamaha's (Suzuki's were easy, almost always blown R/R, and stator after owner fitted a new battery without testing anything)

I have probably tested them all through troubleshooting, but for the sake of getting the electromag/field coil functioning I'm eliminating the harness by going direct from battery/ground into the R/R and through the stator/coil without any success.

I'm one step away from replacing the stator that actually static tests 100% fine, I just need more clarification on if the R/R is operating and routed correctly to satisfy the EM system.
XS 750 Triple Shaftjacker

Offline Sonreir

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Re: 79 XS750 Stator
« Reply #46 on: Jun 12, 2019, 17:56:02 »
For the R/R, the main thing to verify is that you're getting voltage on the white wire. Is that tests out OK with how you have it hooked up, then the other tests are handled with the bike running.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline Garc

  • Posts: 61
Re: 79 XS750 Stator
« Reply #47 on: Jun 12, 2019, 23:43:59 »
So we have battery voltage on the white wire through the R/R following your wiring diagram.

Pulling the power from black signal removes 12V from white.

Going to brown on the field coil with the white wire and green/green creates a spark that blows my signal 12VDC fuse.

Between green and brown on the 3 plug field coil we had 3.6 ohms both ways.  We already proved those were the 2 windings.

Is the alternator bad or the Rectifier/Regulator?


« Last Edit: Jun 12, 2019, 23:46:56 by Garc »
XS 750 Triple Shaftjacker

Offline Sonreir

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Re: 79 XS750 Stator
« Reply #48 on: Jun 13, 2019, 01:10:49 »
So we have battery voltage on the white wire through the R/R following your wiring diagram.

Pulling the power from black signal removes 12V from white.

Going to brown on the field coil with the white wire and green/green creates a spark that blows my signal 12VDC fuse.

Between green and brown on the 3 plug field coil we had 3.6 ohms both ways.  We already proved those were the 2 windings.

Is the alternator bad or the Rectifier/Regulator?




A bit too early to call it just yet, but something isn't adding up. How many amps is the fuse rated at? Any resistance between the brown field coil wire and ground?
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline Garc

  • Posts: 61
Re: 79 XS750 Stator
« Reply #49 on: Jun 13, 2019, 01:36:14 »
Put a 20 amp fuse in, 12.5 battery voltage and 12.2VDC through signal wire and white wire hooked to brown field coil.

Loose Green wire R/R connected  to green field coil now shows .06VDC.
XS 750 Triple Shaftjacker