Alternator problem?

gramgramfirey · Jul 23, 2011

300 Tdi.
Alternator light glows slightly and dims as revs increase. Also light stays on after starting. Give a rev and she goes out.
Question: Is the regulator stuffed or do I need to have the unit recoed?
Any suggestions. Thanks.
:behindsofa:

Station House · Jul 23, 2011

Assuming fan belt not slipping, then sounds like the alternator diode is on the way out.

Don't know if you can recon yourself (sure others will) or whether it's a swap out

gramgramfirey · Jul 23, 2011

Thanks Station House. I recoed it some years ago, thought it was about ready to do again. Might even upgrade to a 100 amp model. Thanks for that confirmation of what I thought was wrong.
Cheers.:beer2:

andy mcd · Jul 29, 2011

sounds like maybe the didoes are on there way out, or maybe the rectifier best check with a multimeter. I have had an alternator pumping out just over 14volts but the warnign light still glowed. It was a fault diode i just replaced with a OE alternator for about £100

gramgramfirey · Jul 30, 2011

Thanks Andy, I`ll think that is the way to go and much less mucking about!
Might even upgrade to a 100 Amp model.

mundungus · Jul 30, 2011

Mine has that second symptom of staying on sometimes after starting until i increase the revs slightly. But once the revs increase it goes out and stays out even if the revs drop back down. I don't think it's causing me any problems.

It doesn't glow otherwise though.

natas · Jul 30, 2011

mundungus said:
Mine has that second symptom of staying on sometimes after starting until i increase the revs slightly. But once the revs increase it goes out and stays out even if the revs drop back down. I don't think it's causing me any problems.

It doesn't glow otherwise though.

Mine also.

Bin doing it since I got her, no problems with the battery yet.

As soon as I give her a rev, light goes out and stays out.............

andy mcd · Jul 30, 2011

I t is normall to have to give a diesel a slight rev to get the warnign light out. All it is doing is exciting the alternator and making it produce its on electricity instead of drawing from the battery

Sean · Jul 30, 2011

check yer tick over speed

Alternator problem?

gramgramfirey

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Station House

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gramgramfirey

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andy mcd

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