Old 14th October 2019, 06:19 PM #1
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Alternator Refurbishment/Rebuild

Hi,

I have an alternator for a cbx 750 that needs the field coil replacing but I haven't found anyone that will specifically rewind and rebuild alternators. Anyone know of a place that can refurbish them in or around Galway? Would be willing to travel a bit further a field if needs be.

Thanks in advance.
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Old 14th October 2019, 06:41 PM #2
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Re: Alternator Refurbishment/Rebuild

Two that I know of:
http://www.autoelectrics.ie/ in Clare.
Westcountry Windings in the Uk.
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Old 14th October 2019, 07:23 PM #3
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Re: Alternator Refurbishment/Rebuild

what year/kind of cbx?might have one here
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Old 14th October 2019, 07:35 PM #4
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
Hi,

I have an alternator for a cbx 750 that needs the field coil replacing but I haven't found anyone that will specifically rewind and rebuild alternators. Anyone know of a place that can refurbish them in or around Galway? Would be willing to travel a bit further a field if needs be.

Thanks in advance.
What part are you talking about and are you sure it needs rewinding. Not called field coil in an alternator. The rotating coil is called a rotor and outer winding is stator. No one that I know of in Ireland doing rewinds anymore.
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Old 14th October 2019, 07:50 PM #5
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Re: Alternator Refurbishment/Rebuild

Thanks for the replies, the bike is a CBX 750 F RC17 1985. I also just realised and remembered the RC42 Nighthawk has the same engine so alternator should in theory also be compatible. If you had one lying around that's suitable I might be interested in it. I'm going to take out the original first in the hopes that it's something simple but if not it's a rebuild/replacement job.
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Old 14th October 2019, 07:54 PM #6
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Re: Alternator Refurbishment/Rebuild

Originally Posted by vifferman
What part are you talking about and are you sure it needs rewinding. Not called field coil in an alternator. The rotating coil is called a rotor and outer winding is stator. No one that I know of in Ireland doing rewinds anymore.
According to the workshop manual its called a field coil. There are five wires in total. Three wires are for the outer winding's as you mention, then there is a pair for the field coil which from what I can gather is a coil internal to the rotor that the engine spins. I haven't pulled it out of the engine yet but I know there is an issue as its not charging and I'm getting no continuity on the pair of wires for the field coil. Which according to the manual there should be.
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Old 14th October 2019, 08:26 PM #7
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
According to the workshop manual its called a field coil. There are five wires in total. Three wires are for the outer winding's as you mention, then there is a pair for the field coil which from what I can gather is a coil internal to the rotor that the engine spins. I haven't pulled it out of the engine yet but I know there is an issue as its not charging and I'm getting no continuity on the pair of wires for the field coil. Which according to the manual there should be.
Excuses my ignorance are there brushes with the Alternator that could be worn.
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Old 14th October 2019, 08:31 PM #8
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
Thanks for the replies, the bike is a CBX 750 F RC17 1985. I also just realised and remembered the RC42 Nighthawk has the same engine so alternator should in theory also be compatible. If you had one lying around that's suitable I might be interested in it. I'm going to take out the original first in the hopes that it's something simple but if not it's a rebuild/replacement job.
ha well youre in luck,thats the engine i have herei'll go digging tomorrow
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Old 14th October 2019, 08:32 PM #9
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Re: Alternator Refurbishment/Rebuild

Originally Posted by Dexy
Excuses my ignorance are there brushes with the Alternator that could be worn.
Hi Dexy,

In this case no from what I can see the system doesn't have brushes. Just seems to be based on induction generating the current.
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Old 14th October 2019, 08:34 PM #10
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
Hi Dexy,

In this case no from what I can see the system doesn't have brushes. Just seems to be based on induction generating the current.
Sound Pal, I used to rewind them in a previous life, all the best with the fix.
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Old 14th October 2019, 08:35 PM #11
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Re: Alternator Refurbishment/Rebuild

Originally Posted by mrdimreaper
ha well youre in luck,thats the engine i have herei'll go digging tomorrow
Before you go ripping it apart just check the alternator first with a multimeter. The three yellow wires need to have continuity between them and no continuity to ground. The black and white wires need to have continuity between them and also none to ground. If that all checks out let me know.
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Old 15th October 2019, 06:28 PM #12
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
According to the workshop manual its called a field coil. There are five wires in total. Three wires are for the outer winding's as you mention, then there is a pair for the field coil which from what I can gather is a coil internal to the rotor that the engine spins. I haven't pulled it out of the engine yet but I know there is an issue as its not charging and I'm getting no continuity on the pair of wires for the field coil. Which according to the manual there should be.
Must be brushless alternator. The coil is stationary and the engine turns the steel rotor around the coil. You should have about 2-3 ohm resistance across the two wires to the rotor coil. If it's open circuit then that's your problem.
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Old 15th October 2019, 06:35 PM #13
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Re: Alternator Refurbishment/Rebuild

Originally Posted by vifferman
No one that I know of in Ireland doing rewinds anymore.
There must be someone in Cork doing it as a friend of mine had his stator on the RSV rewound recently. He dropped the bike into Swanton Motorcycles and Declan sent it off to someone in Cork to rewind it.
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Old 15th October 2019, 07:04 PM #14
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Re: Alternator Refurbishment/Rebuild

Originally Posted by vifferman
Must be brushless alternator. The coil is stationary and the engine turns the steel rotor around the coil. You should have about 2-3 ohm resistance across the two wires to the rotor coil. If it's open circuit then that's your problem.
Yep the stationary coil hasn't got continuity so that's my issue. Now whether I'm going to be lucky in that its just a broken connection somewhere easy to spot or if its repair/replace is what I have to find out once I pull it from the engine.
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Old 15th October 2019, 07:45 PM #15
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Re: Alternator Refurbishment/Rebuild

Originally Posted by Unfazed
There must be someone in Cork doing it as a friend of mine had his stator on the RSV rewound recently. He dropped the bike into Swanton Motorcycles and Declan sent it off to someone in Cork to rewind it.
These guys?
https://www.goldenpages.ie/bandon-rewinds-ltd-bandon/
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Old 20th October 2019, 01:10 PM #16
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Re: Alternator Refurbishment/Rebuild

Originally Posted by mrdimreaper
ha well youre in luck,thats the engine i have herei'll go digging tomorrow
Got the alternator apart and removed the original coil. Nothing obvious at fault and wiggled some wires to see if anything had a bad or loose connection but no luck.

Mrdimreaper if you have a spare on the engine I'd be interested in it. If you want I can do a test with a multimeter on it before you pull it from the engine to make sure its good before pulling it apart. Let me know what suits.
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Old 20th October 2019, 07:39 PM #17
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
Got the alternator apart and removed the original coil. Nothing obvious at fault and wiggled some wires to see if anything had a bad or loose connection but no luck. .......
There's usually a plastic holder for the coil and the two wires from each end of the coil wrap around a small spigot part of the plastic frame. If this is the case, unwind the wires off this as a lot of the time this is where they break.

It's easy to check with a battery. Just connect negative to one end of the coil and flick the positive off the other wire. You should get a nice blue spark as the coil de-energizes.
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Old 20th October 2019, 08:27 PM #18
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Re: Alternator Refurbishment/Rebuild

So did a bit more probing with the meter in case it was a broken wire externally. I cut back the insulation a small bit where the wire's come off the alternator and no continuity. Went a piece further to where the wires enter just before the coils housing in the center and also no continuity. So what I have is a broken wire inside the coil in the center. If you have a look at the pictures you can see three sets of coils on the outer edges of the alternator. There is also another coil in the center encased in a metal housing which has no continuity which is my problem. Thanks for the help trying to diagnose the problem vifferman. Seems I have the options now of drilling the spot welds encasing the center coil or replacing the entire unit.






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Old 21st October 2019, 03:31 PM #19
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
Seems I have the options now of drilling the spot welds encasing the center coil or replacing the entire unit.
At this stage you've nothing to lose by cutting of the string holding the wires and try and pull through the wires to the inner coil right up to where they enter the coil.
That type are replaced as one unit. There's very little clearance between the rotor and the two coils, so you'll have big problems getting everything centered if you separate them.
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Old 29th October 2019, 09:02 PM #20
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Re: Alternator Refurbishment/Rebuild

Originally Posted by f4fwildcat
Got the alternator apart and removed the original coil. Nothing obvious at fault and wiggled some wires to see if anything had a bad or loose connection but no luck.

Mrdimreaper if you have a spare on the engine I'd be interested in it. If you want I can do a test with a multimeter on it before you pull it from the engine to make sure its good before pulling it apart. Let me know what suits.
was away for a bit,ill get onto it
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