[diesel_mercedes] Re: Interesting alternator problem

 

A gut reaction . . . Just for fun check the glow plug relay and see if it is sticking on when it should be off. The glow plugs use more than the alternator can supply. So if they are not turning off when they should the symptoms you describe could be explained. Including passing the test at the FLAPS but still not charging the battery. Note: it may be an intermittent problem at this point. A temporary light wired to the tip of the #5 glow plug would work on either type of glow plug system.


-------- Original Message --------

Subject: Interesting alternator problem
Date: Tue, 11 Jan 2011 21:08:06 -0500
From: Alan Boucher <alstheone@verizon.net>
To: diesel_mercedesl@yahoogroups.com


My 83 300D  has developed an interesting problem.  After 2 or three days 
of normal day and evening driving the battery dies.   The car is in NY 
and is driven 15 to 35 miles at a time.  The battery is approx. 1 Yr 
old.  Now the  red light is coming on.  with no load on the electrical 
system, clean battery and ground terminals, and a fully charged battery, 
it does dim somewhat with increasinng speed.   The local Autozone tested 
the alternator in the car and a spare and said that both were good.  I 
swapped out the alternator with the spare, one of my favorite jobs on 
this car, with the same result.  I checked the brushes in the voltage 
regulator and cleaned the commutators on the spare before I put it in.  
The only thing that I  can't verify is that the voltage regulator is 
working properly.  My next step is to change the voltage regulator.   I 
have  another alternator that was working when the car was wrecked, but 
its under a couple of feet of snow.  Does anyone have any suggestions?

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