Pagoda SL Group
W113 Pagoda SL Group => General Discussion => Topic started by: hands_aus on March 05, 2007, 04:36:20
-
I had the charging system checked on Sunday by the local car club.
The guy said the amps output was down and it was likely the Voltage regualtor or the alternator.
I ruled the alt out because I had it rebuilt about 12 months ago.
Today I put a voltmeter on the battery terminals with nothing except the clock turned on.
at idle, 12.47 Volts
1200rpm 14.4 volts
1300rpm 13.5 volts
with lights (low beam) on
at idle, ~12.9V
increase the rpm, no +ve change The volts kept dropping... was 12.1 Volts when I turned them off.
So my question....
Should the battery terminal voltage increase or stay the same when the lights are switched on?
I cleaned the terminals with fine sand paper but with no difference.
Do I need a new regulator?
As always thanks for your help and any advice gladly received.
Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto
-
Hi Bob,
You may already have these specs, but if not.... see attached.
I'll let another expert jump in here, but for what it's worth, I tested my voltage yesterday and at idle it was reading ~13.5.
I am running with a 35amp alternator, which is only ~2 years old. I replaced my old one which was a 35amp unit not knowing that in my later model, I should have been running a 55amp unit.
Good Luck!
Bob
Download Attachment: (http://images/icon_paperclip.gif) 1.jpg (http://www.sl113.org/forums/uploaded/bpossel/200735807_1.jpg)
66.52 KB
Download Attachment: (http://images/icon_paperclip.gif) 2.jpg (http://www.sl113.org/forums/uploaded/bpossel/2007358025_2.jpg)
33.33 KB
bpossel (Memphis, TN.)
'71 280SL / '97 E320
-
Thanks Bob,
My big worry is about the voltage dropping away with the engine running and the lights on.
I have decided that the regulator needs replacing.
I went to the local Repco store and they say they have sourced a correct replacement from the original numbers taken off the existing unit and will call me tomorrow when it is available.
As the car club meeting is tomorrow night I hope they have truely found a correct unit.
In my travels today I saw a Bosch replacement regulator which was smaller and set in a molded aluminium case. The mounting holes were the same spacing but that is the only similarity and will be a last resort option.
I was wondering how difficult it would be to install an alternator 'internal' regulator in the existing external regulator housing?
I figure it would still work ok, just might need more venting.
This might become my next project.
For appearences I actually want to re-use the old case.
Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto
-
Bob,
quote:
In my travels today I saw a Bosch replacement regulator which was smaller and set in a molded aluminium case. The mounting holes were the same spacing but that is the only similarity and will be a last resort option.
The original points type regulator has now been superceded by the shorter electronic version (0 192 062 007), unless you can find a NOS.
I believe somebody on the site has changed the cover to the old one, or maybe the old cover simply fits over the new one...
naj
68 280SL
-
quote:
Originally posted by naj
The original points type regulator has now been superceded by the shorter electronic version (0 192 062 007), unless you can find a NOS.
[/quote]
Hey Naj,
Does the new version have a model number like KE 57 ?
One auto electrican said it was a replacement.
thanks
Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto
-
Bob,
quote:
Hey Naj,
Does the new version have a model number like KE 57 ?
One auto electrican said it was a replacement.
KE 57 could be a local Ozzie designation. Could not find it in a Euro book :oops:
naj
68 280SL