Lawrence,
Since you have 285K miles and the brushes wore unevenly, it may be that one of the slip rings has worn badly or is pitted. If you have it off the car, you might try removing the voltage regulator / brush assembly and look down the hole the brush came out of to see the condition of the slip rings and compare them. Slowly rotate pulley, so the ring scans by where you are looking.
( I think we are talking about the same thing. I think that on a generator or starter, it is a commutator and it is made up of 20 or so little strips of copper. I think in a Bosch alternator, there are two rings that go all the way around the shaft. I think that is called a slip ring. Corrections, anyone?)
Bobby
On Tue, Mar 10, 2015 at 3:38 PM, Lawrence Rhodes primobassoon@sbcglobal.net [diesel_mercedes] <diesel_mercedes@yahoogroups.com> wrote:
My alternator has 285k on it. Just what does Bosch do when re manufacturing the alternator. New bearings I bet and the brush/regulator. The commutator is the only other thing. Can the commutator go bad? How often do they go bad? My alternator was soaked with hydraulic fluid. That can't be good. LR
From: Lawrence Rhodes <primobassoon@sbcglobal.net>
To: "diesel_mercedes@yahoogroups.com" <diesel_mercedes@yahoogroups.com>
Sent: Tuesday, March 10, 2015 11:22 AM
Subject: Alternator not working. Back to square 1.
No charging. Battery light & brake light on when driving. I guess I'll take the alternator out and have it tested. How many ways can an alternator fail if it has a new regulator/brush combo? Voting against the wires and for the alternator being bad. Lawrence Rhodes
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Toward freedom,
Bobby Yates Emory
Bobby Yates Emory
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Posted by: Bobby Yates Emory <liberty1@gmail.com>
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