Alternator Question

Nodge68 · Nov 26, 2020

6Sabre said:
Hi again Nodge, would that have power with ignition off? Is that the item on the back of the HP pump? TBH using a tube as a stethoscope Im pretty sure its the alternator. Thanks again for ideas.

The HP regulator is modulated for a while after the ignition is turned off, to bleed the pressure out of the rail.

I've never heard of an alternator making a noise when it's stationary, but I guess it's not impossible.

Alibro · Nov 28, 2020

The alternator has several diodes to rectify the three phase ac and a voltage regulator so I guess it's possible something is breaking down there but would it still charge the battery in that case?
It isn't hard to unbolt the main battery lead so that would be your best bet to prove it 100%

6Sabre · Dec 1, 2020

Just to close this off. Its odd as the noise has now cleared for a few days, after a couple of times where it came and went.
99% sure it was the alternator as I eliminated the AC coil, and a stethoscope highlighted the sound as the alternator.
I will see what happens.
Thanks to all for advice.

6Sabre · Jan 29, 2021

So the 'pinging noise 'eventually became permanent, and was flattening the battery in a about 36 hours. So I spent the last couple of months, taking the negative connection off when I left the car for more than 12 hours.
Yesterday after reconnecting the terminal, there was a noise and the alternator was making more noise when running. After 10 mins the ign light came on and no charge. Now getting a new alternator ;-) which is proving a faff as there are apparently several options.

Dippypud · Jan 29, 2021

6Sabre said:
So the 'pinging noise 'eventually became permanent, and was flattening the battery in a about 36 hours. So I spent the last couple of months, taking the negative connection off when I left the car for more than 12 hours.
Yesterday after reconnecting the terminal, there was a noise and the alternator was making more noise when running. After 10 mins the ign light came on and no charge. Now getting a new alternator ;-) which is proving a faff as there are apparently several options.

See if an auto electrician can diagnosed what happen to your alternator and maybe repair it as a spare or for you to recoup some cash ....

Alibro · Jan 29, 2021

A lot of places will sell reconditioned alternators for pretty small money.
It sounds like the electronics on yours was iffy and has finally has gone but it could be used as a part exchange for a repaired one.

6Sabre · Jan 29, 2021

Took it apart and no obvious issues. Did a few resistance checks all seemed ok, so suspect its the regulator at fault. The regulator is £25 and if the rectifier pack proved to have a fault thats £45. I have a new one for £92 off the dreaded bay, with a 2 year warranty so its seems the better idea. Cheers for comments.

Alternator Question

Nodge68

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Alibro

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6Sabre

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6Sabre

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Dippypud

Never Knowingly Understood

Alibro

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6Sabre

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