Alternator regulator replacement - SLK230 - Mercedes-Benz Forum
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#1 (permalink) Old 03-22-2008, 09:58 PM
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Alternator regulator replacement - SLK230

I checked my charge voltage last week, only max of 13.8v no load dropping to 13.0v with lights and heater fan on full.

Decided to try a new regulator. Mercedes Benz Parts, Mercedes Parts, Accessories

Remove NEG batt lead.
Drive front up onto ramps, chock rear wheels.
Undo 4 x 10mm sump shield screws (had to swap mine for cross head self tappers as the old ones were buggered)
Slide out lower cover.(sump shield)
(Note: If removing alt slacken off belt anr lift off crank pulley, undo 2 wire terminal nuts off alt and the 2 17mm thru bolts and lever alt down.)

To replace regulator in situ follow these inst:
Undo 3 small screws on rear dust cover.
Hold out clips on cover and remove.
Undo 2 cross head screws on Regulator and remove.
Lift out reg.
Mine had worn brushes BUT they were still making contact with a few millimetres of pressure.
Wipe slip rings and contact strip with a rag sparingly sprayed with carb cleaner etc.
Dont worry re wear on slip rings as new brushes will bed in.
If slip rings worh thru you will need a new alt anyway.
Replace reg with the new one.
Note: when ordering Reg quote the Bosch number on the alt as there are 2 types on these, 14mm and 24mm slip ring diameter, mine is 14mm. Both are 14volt.
Replace 2 screws on reg.
Clip on end cover.
Replace 3 small screws.

If you did not remove Alt connect up Neg batt term and start engine. Check voltage. Should be around 14 volts.
Mine was 14.2 with acc on

If you removed Alt, replace 2 thru bolts and 2 wires, refit drive belt and neg term.

Refit sump cover.

bazzle
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Last edited by Bazzle; 03-22-2008 at 10:03 PM.
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#2 (permalink) Old 03-22-2008, 10:02 PM
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#3 (permalink) Old 03-23-2008, 12:12 AM
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were you having charge problems? it would seem 13.8 would be sufficient to keep it charged well. 13 is a bit low though.
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#4 (permalink) Old 03-23-2008, 12:44 AM
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Originally Posted by berk View Post
were you having charge problems? it would seem 13.8 would be sufficient to keep it charged well. 13 is a bit low though.
Many, Many tears (years) ago when I started my Electrical and mechanical engineering degree we were taught the preventive maintenance principles.
Now a days its dont touch unless it broke...

It has served me well over the years. If I see something that is close to its limits I will have a look. For $26 this one was well worth the look

Bazzle
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#5 (permalink) Old 03-29-2008, 06:48 PM
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Bazzle>> I emailed and asked the price today and I was told the Voltage regulator was $49, shipping was $24. You mentioned you got it last week for $26. Any idea?
Thank You
Jocelyn
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#6 (permalink) Old 03-29-2008, 07:40 PM
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Originally Posted by tobyls2555 View Post
Bazzle>> I emailed and asked the price today and I was told the Voltage regulator was $49, shipping was $24. You mentioned you got it last week for $26. Any idea?
Thank You
Jocelyn
Emailed whom?
Where do you live on the planet?

Heres one link:
http://cgi.ebay.com/ebaymotors/ws/eB...019573390&rd=1

You need to know what alternator is in yours??

Bazzle

Last edited by Bazzle; 03-29-2008 at 11:49 PM.
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#7 (permalink) Old 03-30-2008, 06:27 PM
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Quote:
Originally Posted by Bazzle View Post

Decided to try a new regulator. Mercedes Benz Parts, Mercedes Parts, Accessories


bazzle
I emailed the people from your link and I was told it is called a voltage regulator, $49, shipping was $24.My car is a 1999 SLK 230. I was wondering if anyone can tell where I might find my alternator so I can locate its number.
Thank You
Jocelyn
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#8 (permalink) Old 03-30-2008, 09:54 PM
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If you see my 2nd last pic that one shows the part number on Alt.
You will have to drop the lower engine cover as per my instructions above. Its on the bottom right hand side of engine front.

Bazzle
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#9 (permalink) Old 03-31-2008, 10:13 AM
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Thank You Bazzle!
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#10 (permalink) Old 03-31-2008, 10:55 AM
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Mine is 14.18 unload and 14.01 load (all the light's on and airblower) guess that i dont need to change mine jet.

1999 230 SLK
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