Zorro587

Active Member

• Oct 3, 2014

• #1

Hi all,

I've noticed a high pitched whine (like a noise something electrical/electronic might make) when the RR is switched off, key out of the ignition.

I can hear it in the engine bay with the bonnet up.

I was surprised to find the battery flat this morning as it started fine yesterday (haven't run it since last Saturday).

Any ideas would be appreciated.

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Oct 3, 2014

• #2

Hmmmm on my classic, the brake boost pump kept running as the relay stuck closed, burnt out the pump and flattened the battery!,

 

Zorro587

Active Member

• Oct 3, 2014

• #3

Check under way!! Thanks

 

Zorro587

Active Member

• Oct 3, 2014

• #4

OK, so having had a quick look and using the screwdriver-pushed-up-to-the-ear stethoscope, the whining appears to be coming from the alternator.

Is there something I have missed about alternator technology?

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

Full Member

• Oct 3, 2014

• #5

Sounds like it could be a loose connection inside. Something could be about to give up. What kind of charging voltage do you get?

 

wammers

No longer with us, RIP

Donater

• Oct 3, 2014

• #6

Duff diode allowing current drain.

 

Zorro587

Active Member

• Oct 10, 2014

• #7

Alternator swapped out, no more noise. Weirdly the noise stopped as the alternator moved as I removed it. May be a loose connection internally. Refurb time.

 

Datatek

Well-Known Member

• Oct 10, 2014

• #8

Zorro587 said:

Alternator swapped out, no more noise. Weirdly the noise stopped as the alternator moved as I removed it. May be a loose connection internally. Refurb time.

Click to expand...

Shorted/loose turns on the windings can cause what you describe.