19 replies to this topic

[gaspen]

 

I'm waiting for the new brush set so I check what I can check on the alternator.
 
The Rectifier
 
I learnt that all 9 diodes should allow the voltage to flow only for one direction. I've measured them with a multimeter switched to diode test. 
 
Diodes in circuit 2 and 3 are all the same (where the outputs are)  but circuit 1 flows in the opposite direction 
 
Is it the normal operation ?
 
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I'd need to look at one and a diagram to be sure but I guess it is fine.


If it's an original rectifier assembly then that should be fine, a diode wouldn't fail and reverse it's direction as far as I'm aware. If the readings are the same as the others but reversed, I say it's fine.

If it's a replacement part, who knows.

 

 

 

I bought a complete repair kit from ebay a while ago.

 

Regarding to the manual that circuit (1) will help "build-up" the magnetic field inside the alternator during start.

 

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[Designer]

Hi Gaspen

 

Well my brain due to age was reasonably muddled but having read the above it is now totally toasted.       

 

Paddy

[gaspen]

Hi Gaspen

 

Well my brain due to age was reasonably muddled but having read the above it is now totally toasted.       

 

Paddy

 

This is why they installed a litte fan on the alternator 

[gaspen]

If you are intrested and don't want to import from UK this one is an alternative

 

Price ~1,50 EUR

 

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Edited by gaspen, 04 November 2024 - 06:10 PM.

[gaspen]

Job done 

 

Steady 14.33V at the alternator, 14.1V at the battery. The charge starts for a little throttle but it works

 

For test drive I'm going to the workplace the Mini 

 

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