Omega Owners Forum

Omega Help Area => Omega Electrical and Audio Help => Topic started by: DrAndyB on 31 January 2016, 18:26:24

Title: Suspect alternator, can you replace diodes ?
Post by: DrAndyB on 31 January 2016, 18:26:24

Hi all,

My Father's 2.2 Auto Petrol (face lift Y plate) I believe as a goosed alternator.  I read somewhere you can get a new Diode pack ?

Story is :

• on driving to hospital he experienced a Christmas tree of lights come on the dash
• autobox appeared to stay in 3rd but managed to get there and back
• next morning battery was flat and had to use manual key to gain entry as locks not responding to fob
  
• charged battery for few hours to get some life and Left overnight, but following morning battery volts had plummeted
• battery is 4years old

His mechanic is coming tomorrow to look but I assume if alternator diodes faulty then they could short battery this causing the drain overnight ?  Or there is a issue with one of the electrical circuits on the car.

He has got a new battery to put on it now, but I was wondering if the Diode pack can be replaced (if its that) and how much one would expect pack to be - cheaper than an alternator I assume  :y

Thanks in advance.

Title: Re: Suspect alternator, can you replace diodes ?
Post by: TheBoy on 31 January 2016, 18:44:00

The rectifier (diode pack) can be purchased separately from various sources.

Straightforward to measure to prove faulty.  Doubt it would cause a drain on battery though?

Title: Re: Suspect alternator, can you replace diodes ?
Post by: DrAndyB on 31 January 2016, 19:22:25

Thanks.

Battery was zero, so maybe a failed battery having had a bit of a Workout if alternator goosed ?

Hopefully can get sorted but will pass on good news that Diode pack can be obtained  :y

Ta.

Title: Re: Suspect alternator, can you replace diodes ?
Post by: DrAndyB on 01 February 2016, 16:49:38

# UPDATE #

Alternator voltage 18V  :D :D :D :D

New Diode Pack ordered.

Hopefully that will sort it  :y

Thanks all.

Title: Re: Suspect alternator, can you replace diodes ?
Post by: TheBoy on 01 February 2016, 17:48:54

Quote from: DrAndyB on 01 February 2016, 16:49:38

# UPDATE #

Alternator voltage 18V  :D :D :D :D

New Diode Pack ordered.

Hopefully that will sort it  :y

Thanks all.

Is that including regulator, as its that that's failed, not the rectifyer

Title: Re: Suspect alternator, can you replace diodes ?
Post by: DrAndyB on 01 February 2016, 18:47:51

Quote from: TheBoy on 01 February 2016, 17:48:54

Quote from: DrAndyB on 01 February 2016, 16:49:38

# UPDATE #

Alternator voltage 18V  :D :D :D :D

New Diode Pack ordered.

Hopefully that will sort it  :y

Thanks all.

Is that including regulator, as its that that's failed, not the rectifyer

 :-[  Ooops, Yep, I mean Regulator.  The module which bolts onto Alternator - Part F00M146609  :y 

Ordered today of Tinterweb  :y - He got one for £20

I only deal with 132,000 AC Voltages  :D  Non of that new fangled DC 8)

Title: Re: Suspect alternator, can you replace diodes ?
Post by: Marks DTM Calib on 03 February 2016, 11:48:11

Quote from: DrAndyB on 01 February 2016, 18:47:51

Quote from: TheBoy on 01 February 2016, 17:48:54

Quote from: DrAndyB on 01 February 2016, 16:49:38

# UPDATE #

Alternator voltage 18V  :D :D :D :D

New Diode Pack ordered.

Hopefully that will sort it  :y

Thanks all.

Is that including regulator, as its that that's failed, not the rectifyer

 :-[  Ooops, Yep, I mean Regulator.  The module which bolts onto Alternator - Part F00M146609  :y 

Ordered today of Tinterweb  :y - He got one for £20

I only deal with 132,000 AC Voltages  :D  Non of that new fangled DC 8)

Your not trying, I mess with upto that and beyond in AC and DC.........and 11kV........on ships!  :y

But yes, its always the reg that goes (short circuit in this case), watch the battery as over voltage can boil them

Title: Re: Suspect alternator, can you replace diodes ?
Post by: DrAndyB on 03 February 2016, 19:59:19

#  UPDATE  #

All fixed, regulator replaced (F00M146609) and all is well.  Stable charging voltage with a new battery and new fan belt fitted :D

Thanks all for help and and advice.

Happy motoring  :y

Title: Re: Suspect alternator, can you replace diodes ?
Post by: TheBoy on 03 February 2016, 21:58:58

Good news :)

Title: Re: Suspect alternator, can you replace diodes ?
Post by: RudeYoot on 26 March 2016, 00:53:46

How do you change these diodes? where are they located on 3.0 elite auto?

Title: Re: Suspect alternator, can you replace diodes ?
Post by: zirk on 26 March 2016, 07:05:11

Quote from: RudeYoot on 26 March 2016, 00:53:46

How do you change these diodes? where are they located on 3.0 elite auto?

The Diodes are the key components of the rectifier pack.