Alternator differences

[Peter Orban]

Hi Radek,
Do not overlook the fact that there could be enough corrosion between the alternator metal components that would impede the flow of electricity.
Every sub-component of he alternator on my son's car was fine, except where the rectifier block was bolted to the alternator frame there was enough corrosion for the alternator not to work correctly.Similarly, on his starter the ground "did not get" from the front of the starter where it is bolted to the bell housing to the end plate of the starter where some of the brushes are grounded. The ground current eventually went through the bearings (sintered bushings) and the shaft of the starter, ultimately destroying the bushes.
What I am saying is that take every bolted connection apart on the alternator where electricity is supposed to flow, clean the mating surfaces, apply some dielectric grease, and reassemble, assuming that all the components are otherwise fine.
PS. We live in the rust belt.

Good luck, Peter
    Message: 1
Date: Mon, 6 Jul 2015 22:47:16 -0700
From: Tihol Tiholov <t.tiholov at gmail.com>
To: "quattro at audifans.com" <quattro at audifans.com>
Subject: Re: Alternator differences (Radek)
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>
> From: "Radek" <radek at uniserve.com>
> To: <quattro at audifans.com>
> Subject: Alternator differences
> Message-ID: <C97B0D45CF0F467DB299316122819C59 at Compaq>
> Content-Type: text/plain;      charset="iso-8859-1"
>
> Obligatory Audi content:  5-cyl in my Eurovan.
> The alternator in my 93 EV is not charging, even though brushes are ok.  I
> have a spare alternator for my daughter's 04 Jetta - it's physically
> identical and fits the EV; however, there is a slight difference in the
> electrical connections.  The main charging wire connector is the same - a
> post with 13mm nut on it.  The small connector, though, is different:  a
> single blue wire on the EV, two black wires on the Jetta.  When I look at
> the broken EV alternator, there is a double connector on it as well, but
> only one wire goes to it.  On the Jetta, two wires go to the connector.
> Can I swap the alternators?  BTW, the Jetta alternator has letters L DFM
> next to the small double wire connector.
> Thanks.
>
> Radek
> electrically challenged
>

Before swapping alternators, you could check the diode couples in the '93
alt. I went to a shop and and had them changed - all's been well since. Huw
would probably give you all the details

-- 
Tihol


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