21 replies to this topic

[germini30]

My alternator is making a whiney sound. If I disconnect the plug off the alternator the noise stops. The more load I put on the alternator the louder the whine. Is it best to scrap it and buy a new one

[cal844]

I'd say the bearings are shot in the alternator, which can be replaced cheaper than a new unit. I'd also recommend a new belt

[Spider]

As I mentioned in the same post you had running a week or so back, it'll be the Rectifier Pack.

 

They used to be none too dear to buy and not that hard to replace, however, you'll need a good soldering iron.

[Bat]

As I mentioned in the same post you had running a week or so back, it'll be the Rectifier Pack.

 

They used to be none too dear to buy and not that hard to replace, however, you'll need a good soldering iron.

 

For good soldering iron he means at least 100watts!

[Bat]

Hi,

To see if it's the bearings or rectifier un plug the alternator and run the engine. 

Cheers 

[germini30]

It's only making the noise when the plug is in and engine running. With the plug off it's as quiet as a mouse lol.

[germini30]

Is the rectifier easily replaced

[Bat]

Hi,

That's where the soldering iron comes in. You have to strip the alternator down and unsolder the rectifier from the stator.

The stator is the corrugated ring you can see in the middle of the alternator.

Solder the new rectifier back on.

All the mass of copper wire in there will absorb the heat from the soldering iron, that's why you need a powerful one.

Cheers 

[germini30]

I got one that's 80watt

[Wiggy]

Using flux will help the solder liquefy if you're struggling with a lack of power.

[germini30]

Just looking online. A new unit is about £48 on ebay. Probably better off with that I guess

[Bat]

Hi,

By the time you've bought the parts and spent time doing it your probably no better off...

Cheers 

[germini30]

No exactly

[germini30]

Which of these is best. I only have a bog standard mini 30 but with a 075 battery

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[germini30]

Just noticed that with the plug off and engine running that the battery light doesn't come on. I have found that the earth wire from the alternator plug is not connected to anything. Would that cause a problem like this?? Can't go out and mess with the car now as neighbours will moan