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#1
08-29-2011, 06:55 PM
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w115 300D Alternator Question-HELP!
Ok, I bought the 1975 w115 300D knowing it had some issues, the battery keeps draining, driving around town, its a new battery and will hold a charge.
So I imagine that the alternator is bad and not charging the battery, thus the drain. Can someone show me a picture of the alternator and how to take it out and to test it. Thanks Keith 
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#2
08-29-2011, 08:31 PM
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Quote:
There have got to be pics on the net showing the 300D alternator plus R&R. Look around a little bit.
__________________
Strelnik Invest in America: Buy a Congressman! 1950 170SD 1951 Citroen 11BN 1953 Citroen 11BNF limo 1953 220a project 1959 180D 1960 190D 1960 Borgward Isabella TS 2dr 1983 240D daily driver 1983 380SL 1990 350SDL daily driver alt 3 x Citroen DS21M, down from 5 3 x Citroen 2CV, down from 6
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#3
08-29-2011, 09:03 PM
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Quote:
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#5
09-10-2011, 03:52 AM
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Where's the drain ??????????
Quote:
If you know you have a drain, remove one of the battery terminals when you park the car. The battery doesn't die from being discharged, charge it up again soon. The longer it sits without 'juice' is what kills it !! especially fully discharged. My first guess was also the glow plug system , not the alternator, being the drain culprit. You can check with the weak battery, get the car started maybe jumped with doubled up cables. Best in the dark, let it idle, when you rev up the 'gas' lightly the interior light should be getting brighter, when you let go of the gas it should dim again (given the idle is low enough.). The same with the headlights, but those are harder to see from inside the car. That would tell you , if it's charging. The drain could be caused by just about anything electrical on the car. Shot back a QUICK REPLY, when you can good Luck Alex
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#6
09-10-2011, 10:59 AM
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#7
09-10-2011, 04:56 PM
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Most alternators dont fail, but the internal regulator wears out. You can remove this regulator from the back of the alternator and compare the brush length from yours to a new one. Also its very important that the belt is at proper tension.
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#8
09-10-2011, 04:59 PM
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If it runs you can take it to any good parts house, AutoZone, NAPA and they will test it on the spot and can usually tell you what the problem is.
__________________
Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it!
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#9
09-12-2011, 11:25 PM
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Before you do all that previous stuff, get into the car and turn the on but do not start it. Make sure the generator light is on, or alt light. If it's not on, you need a new bulb. If it's on, take it in for testing.
If the alt light flickers when you drive, you may need new brushes.
__________________
Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952.
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#10
09-13-2011, 12:05 AM
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The brushes are part of the regulator. An auto parts store generally cannt separate a faulty regulator from a faulty alternator during the test. Regulators are rather inexpensive in relation to a replacement alternator. And truth be told, most rebuilts are just a new regulator and maybe a set of bearings.
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#11
09-13-2011, 02:28 AM
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AWOL
Looks like our original poster has gone AWOL.
I can sell you an alternator, that you may not need, too.  The last couple of posts combined will give you a good picture. The (red) light on your gauges should come on (solid and bright) when the ignition is on with out the car running. Once the car is running and the idle is raised enough that light should turn off ( compare my earlier post, with the interior light, when the idle or engine speed is high enough the regulator will let the alternator charge, meaning, that the red dash light goes out and the interior light brightens because of the charge). If this red light only dims , the brushes are worn and need replacing. See other post, replace regulator screwed into the back of the alternator. As I said before , the drain is possibly elsewhere... Alex BTW, I'm in L A (N county), where are you ?
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#12
09-13-2011, 03:09 AM
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In Stockton 60 miles south of Sacramento. I've got a daughter in San Dimas.
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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