Topic: Alternator works sporadically. Is this normal?

[juntjoo]

I monitor it with my handlebar voltmeter and for example in one moment at 5k rpm I'm getting 13.8-14 volts, then a moment later it's around 10.5-10.7 also at 5k rpm. Will the regulator/rectifier back off depending on certain conditions independant of rpm? Or is this a defective regulator/rectifier? I have two, one for my 640, and another for a 750. The issue now is with the 650 one. I've been using the 750 one and just decided to try my original one as the 750 one works but just not enough to keep battery charging. Cheap Walmart battery seems to charge just fine with my battery charger

[caluser2000]

What sort of 750 m/c are we talking about here. If DOHC the brushes in the may be worn down. SHOC CB650 use the charging set up as well.

[juntjoo]

What sort of 750 m/c are we talking about here. If DOHC the brushes in the may be worn down. SHOC CB650 use the charging set up as well.

I'd guess sohc without looking it up, but this isn't normal then?

[caluser2000]

Depends on component wear.

Again what model 750 is it?

[fizzlebottom]

Are there any other symptoms other than what your voltmeter is reading? Does the bike run well, charge the battery, and restart easily with a warmed up engine?

[juntjoo]

Depends on component wear.

Again what model 750 is it?

82-83 cb750sc (nighthawk), "Caltric" brand.

[caluser2000]

Depends on component wear.

Again what model 750 is it?

82-83 cb750sc (nighthawk), "Caltric" brand.

Never heard of it before, Got a pic of it?

[juntjoo]

Depends on component wear.

Again what model 750 is it?

82-83 cb750sc (nighthawk), "Caltric" brand.

Never heard of it before, Got a pic of it?

[caluser2000]

Are there any other symptoms other than what your voltmeter is reading? Does the bike run well, charge the battery, and restart easily with a warmed up engine?

Indeed. Why did the OP decide he needed to check the voltage output in the first place?

[caluser2000]

Depends on component wear.

Again what model 750 is it?

82-83 cb750sc (nighthawk), "Caltric" brand.

Never heard of it before, Got a pic of it?

THE BIKE! So I know what we are dealing with here.

[juntjoo]

Depends on component wear.

Again what model 750 is it?

82-83 cb750sc (nighthawk), "Caltric" brand.

Never heard of it before, Got a pic of it?

THE BIKE! So I know what we are dealing with here.

Oh, mines the 650 nighthawk 82. I'll get a pic..

[juntjoo]

https://us-browse.startpage.com/av/anon-image?piurl=https%3A%2F%2Fi.pinimg.com%2Foriginals%2F7f%2Fc9%2Fe4%2F7fc9e4304a954cb4060662beab991a20.jpg&sp=1618279016T7e3b9ad7b86d336fb57a90d92fcb9a1ce4f1030261b8a036d29175b58643ecb9

[caluser2000]

Depends on component wear.

Again what model 750 is it?

82-83 cb750sc (nighthawk), "Caltric" brand.

Never heard of it before, Got a pic of it?

THE BIKE! So I know what we are dealing with here.

Oh, mines the 650 nighthawk 82. I'll get a pic..

THE 750 you mentioned testing!! I asked for its details twice now

[754]

I got a question.. is this the same set of windings  you forced into the cover, then later found out the notches for the fastening screws were not lined up ?

[juntjoo]

I got a question.. is this the same set of windings  you forced into the cover, then later found out the notches for the fastening screws were not lined up ?

Yes!

[juntjoo]

Anyone else have a Caltric? I probably ruined it somehow. I bent the windings a little then bent them back. Would that probably cause a slight decrease in performance?

[754]

Like I said back then , if the insulation  got compromised it could fail later. If insulation  is off or cracked , it can short out intermittenly or maybe for good.
 The last thing you want to do those wires is mash them together or let anything hit or bend themf

[fizzlebottom]

Wait so you are using a stator meant for a 750 in your 650? Those two are not listed by parts houses as the same P/N, so I really have no idea what could be going on in your case. If you haven't already, I think you gotta start by putting the right parts back in the bike. New ones if the old aren't up for it.

[caluser2000]

They have different output connectors

[juntjoo]

Wait so you are using a stator meant for a 750 in your 650? Those two are not listed by parts houses as the same P/N, so I really have no idea what could be going on in your case. If you haven't already, I think you gotta start by putting the right parts back in the bike. New ones if the old aren't up for it.

I've been using a stator and rotor for the 750. I JUST popped in the 650 regulator just to see how it would work

[caluser2000]

A few coats of clear nail polish will fix insulation cracks in wiring no problem at all.

[juntjoo]

So the individual copper wires can't touch each other or what. If that's the case after being squashed a little, I probably shorted it JUST a little, so it appears to work but just not enough. I gave no idea. I would have figured the wires bunched together were all doing the same job anyway

Actually, I'd rather have a regulator/rectifier you could tweak. Is there a mod for this? I read about some mods that just made it better but I'd like to be able to have some manual control if possible

[juntjoo]

A few coats of clear nail polish will fix insulation cracks in wiring no problem at all.

What can't touch what exactly in there? Each indivual wire to any other, or group of wires to another, or any wire just anywhere else like the metal body?

[bryanj]

No there isnt a reg you can "tweak" nor a mod to do it unless you are an electronics engineer who builds from scratch.
Fitting the wrong windings has removed the varnish insulation from the copper wire and turned the stator into scrap

[caluser2000]

No there isnt a reg you can "tweak" nor a mod to do it unless you are an electronics engineer who builds from scratch.
Fitting the wrong windings has removed the varnish insulation from the copper wire and turned the stator into scrap

No it is not scrap. Nail varnish will cover the exposed copper in a pinch.

Worked fine for our fathers and grand fathers ol bean.

As long as the coil has the correct resistance and windings are not shorting it will be fine.

[bryanj]

Considering what the op has done to it do you realy think he is capable of separating every damaged wire, varnishing and fitting it correctly as its also from a different bike!
I stand by my comment ---- its scrap

[StockRider]

The electrical legacy with this bike is lengthy and should be referenced for future readers.

The most recent episode started here:

http://forums.sohc4.net/index.php/topic,185320.0.html

Then continued here:

http://forums.sohc4.net/index.php/topic,185626.0.html

where this post: http://forums.sohc4.net/index.php/topic,185626.msg2150224.html#msg2150224 describes the use of a mallet to get the stator to fit.

[caluser2000]

The electrical legacy with this bike is lengthy and should be referenced for future readers.

The most recent episode started here:

http://forums.sohc4.net/index.php/topic,185320.0.html

Then continued here:

http://forums.sohc4.net/index.php/topic,185626.0.html

where this post: http://forums.sohc4.net/index.php/topic,185626.msg2150224.html#msg2150224 describes the use of a mallet to get the stator to fit.

Did you PM him of his errors. If so what wa his reply.? I bet it was the same as my reply to the PM you sent me Deltarider.

[juntjoo]

Lol, what's going? I feel like I'm on trial but not being called to the stand lol. I'll admit all guilt right here and now. Even for future crimes. But please have mercy.

And you guys can ask me anything. I'll tell the truth to the best of my ability

[caluser2000]

Lol, what's going? I feel like I'm on trial but not being called to the stand lol. I'll admit all guilt right here and now. Even for future crimes. But please have mercy.

And you guys can ask me anything. I'll tell the truth to the best of my ability

Lol at least you have a sense of humor,

Unlike some of the resident "Ex Spirts"

[dave500]

if its some cheap arse meter it might be picking up RF interference and speak with forked tongue?especially with the fickle 650 ignition system maybe?

[caluser2000]

if its some cheap arse meter it might be picking up RF interference and speak with forked tongue?especially with the fickle 650 ignition system maybe?

It's a bit like using imaginary tire pressures really

[Airborne 82nd]

Considering what the op has done to it do you realy think he is capable of separating every damaged wire, varnishing and fitting it correctly as its also from a different bike!
I stand by my comment ---- its scrap

Hell yes This could be the making of a good show. Lets call it working on Gomer Pyles bike with MacGyver as the mechanic. Episode 1 let me cram all these wires in this hole. Oh! it's to small don't worry my Pa use to just pour Ma's old nail polish on it when it hardens up you won't even need that dang cover.
Sorry I drifted away What were we talking about? Oh Alternator works sporadically. Is this normal? yeah every other cycle.

[caluser2000]

Some of use are capable and able the get results by thinking outside the box. Others can't think for themselves.

I was a grumpy Sgt for most of my 23 year service career.

[juntjoo]

Considering what the op has done to it do you realy think he is capable of separating every damaged wire, varnishing and fitting it correctly as its also from a different bike!
I stand by my comment ---- its scrap

Hell yes This could be the making of a good show. Lets call it working on Gomer Pyles bike with MacGyver as the mechanic. Episode 1 let me cram all these wires in this hole. Oh! it's to small don't worry my Pa use to just pour Ma's old nail polish on it when it hardens up you won't even need that dang cover.
Sorry I drifted away What were we talking about? Oh Alternator works sporadically. Is this normal? yeah every other cycle.

I appreciate the comparison to MacGyver. He was one of my childhood heroes. He and the guy who had the watch/clock that would stop time. What show was that one? Prolly was only one season

[juntjoo]

...
I was a grumpy Sgt for most of my 23 year service career.

Meaning cuz you couldn't (think outside the box)?

[caluser2000]

...
I was a grumpy Sgt for most of my 23 year service career.

Meaning cuz you couldn't (think outside the box)?

No. Because I got frustrated with the young'ns for not thinking at all. 

Some of the engineering officers where just as bad