2017 V9 stator ac voltage testing

[Roland Donnell]

Maybe pointless trying to attribute a cause of a stator that is almost equally anemic on all Stages. It just is what it is, but could (I guess) result in the loss of 2 or 3 charging volts which is what I am experiencing. I don't have any kind of a table that expresses input (AC) voltage to the regulator/rectifier to output (DC) voltage. Installing a new stator lets say that does produce the specification AC voltages doesn't mean that the regulator/rectifier is going to result in an elevated output of DC volts. I have buried myself (and very grateful in all the contributions) in the pages on this site related to these issues. I see many personal references about what the current V9 source options are for replacement stators and regulator/rectifiers (from personal experience). Some may be better as matched pairs. Anyway I would appreciate your parts recommendations. Thanks.

Service Station Manual 2Q000193


My readings. Took an additional 700 rpm to equal AC specifications value.

 

[Moto-Uno]

It might help if you could tell us what your actual charging voltage at the battery is ? Peter

 

[Roland Donnell]

Cold engine values. If it would stay this way all good. After 30-40 minutes on the road the indicated voltage has degraded incrementally to 12-12.1 volts at higher rpms and the battery is beginning to discharge to which on restart I get the clicks and the starter will not engage. Revving over 3k may momentarily bring it up to 12.5 volts. My guess it's losing stator performance when hot. The regulator part of the rectifier is probably okay since the voltage does exceed 14.3. Parallels cited the forum.
(note the type error stage 4 in the table should 3).

 

[Moto-Uno]

If a fellow V7 owner's experience is anything to go by , when he removed his rotor he was able to see the 2 or 3
coils which had darkened to near black on the stator which were causing a similar problem when hot . Peter

 

[GTM®]

See thread linked below. I'll likely combine this one with it shortly.

V7/9 Wet stator failure

Here is a pic of a new unit then mine with one coil shorted to ground. Pads said it was fine. I am relatively certain it is a POS made in China for one of their scooters. Mine is far from the only one to fail. Pics below. Purchase info to support this site...

www.guzzitech.com

Purchase info;

V7 III - V9 Stator

OEM Guzzi Repli Stator Replace your failed OEM Guzzi stator, without purchasing the entire assembly from Guzzi, at half the cost. While we can't prove it, this could likely be the same Made-in-Asia OEM Guzzi stator that Guzzi uses on the 2017+ V7 III & V9 oil-bathed charging system. You will...

gtmotocycles.com

 

[Roland Donnell]

Couple of suspect areas but looks more like insulating resin or varnish drips from assembly and nothing like the roasted examples I've seen.
Parts on order from the store. Just a side note removed the stator cover without unfastening or removing the ABS bracket. Tank was not removed for this or harness access. I'll do a separate write up on that after reassembly. Thanks.

 

[Moto-Uno]

Certainly no where as obvious as the one's I've seen , where a few entire coils are burned looking , but this
may be how they started . Peter

 

[GerryAZ]

Insulation resistance tends to decrease with increasing temperature on weak insulation so there could be turn-to-turn insulation breakdown at higher temperatures which would cause reduced output. If the insulation has not failed fully, then output returns to normal after cooling down.