Is my alternator on its way out

[bignev]

Hi all

Started up the GU patrol (2007 CRD) yesterday and the dash lights wouldn't go out (the typical lights you see when alternator is kaput). Used a battery tester which confirmed alternator wasn't producing output. A few hours later I had to move the patrol on to the road, everything back to normal. Retested and all ok. Move the patrol back onto the drive, dash lights back on, alternator kaput. I checked for loose connections/ broken wires but couldn't see anything. I started the patrol this morning, everything ok.

Alternator is only a few years old (a cheapy one), so I am wondering if it is on its way out or something else I should investigate

thanks in advance
NEV

[growler2058]

Are the brushes replaceable?

[Cuppa]

Are the brushes replaceable?

My thought also was brushes. When worn almost at the end of their life they can sit a bit crooked in their holders & not make proper contact with the slip ring. This may explain why seeing the lights is not consistent.

@Growler - do some alternators not have replaceable brushes? Haven’t come across one before?

Another possibility whilst I think of it, only ‘cos I had it happen to me once - brushes were fine but the plastic brush holders had hardened, cracked & were in the process of braking up - same symptoms.

[growler2058]

My thought also was brushes. When worn almost at the end of their life they can sit a bit crooked in their holders & not make proper contact with the slip ring. This may explain why seeing the lights is not consistent.

@Growler - do some alternators not have replaceable brushes? Haven’t come across one before?

Another possibility whilst I think of it, only ‘cos I had it happen to me once - brushes were fine but the plastic brush holders had hardened, cracked & were in the process of braking up - same symptoms.

I’m sure I have replaced them before, just can’t remember on what? May have been an old Holden even

[mudnut]

Different horses for different courses. Any different brand can have different set ups. Some will have replaceable brushes others need a whole regulator assembly. Or if it is computer controlled, whatever. You will have to do a bit of research or take it it out and look.

Don't be afraid to get a little creative. We used Ford Falcon brushes in a Nippondenso alternator by drilling some holes to accommodate the different style of pigtail. That alternator lasted another 7 years.

[bignev]

thanks guys for your prompt response, given the alternator was a cheapy (130 from memory), might invest in a decent one. Anyone know about OEX ones from repco. Can Pick one up tomorrow.

[PeeBee]

OEX are fine, had a couple, reliable.