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#1
08-08-2010, 06:50 PM
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1985 300sd batttery light staying on
Got to work this evening and noticed when I turned car off battery light still on. Cranked the car and light goes off. What is going on. I took ground off of battery so I would not drain. Did notice it had a spark on the terminal. Again this is with the key out of ignition.
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Joseph Blackwell 1985 300SD 1990 300 2.5 Turbo 
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#2
08-08-2010, 08:55 PM
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Answer
The most common answer is a shorted voltage regulator.
NOTE: The 1985 300SD requires the following Long Brush regulator... Voltage Regulator, Internal Type (Long Brush) MB# 002 154 72 06 Fastlane: Voltage Regulator http://catalog.peachparts.com/item.wws?sku=W0133-1813438 Have a great day.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ Last edited by whunter; 06-06-2011 at 04:57 PM.
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#3
08-08-2010, 10:46 PM
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X2 its probably the reg. You could try unplugging the reg & see if the light goes out. This will remove the slight chance of it being a wiring problem.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#4
08-09-2010, 02:47 PM
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update
I removed the voltage regulator from alternator and still have a battery light with the key out of ignition... I removed the ground from battery to prevent drainage of battery to get home this morning. One other thing, when I crank the engine I do NOT have a battery light.
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Joseph Blackwell 1985 300SD 1990 300 2.5 Turbo
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#5
08-09-2010, 09:50 PM
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If you had the reg unplugged as well as removed, then it looks like you have a wiring problem. Probably the wire from the idiot light to the reg (the thin one) is some how getting power to it, probably a short in the loom or the plug.
If you didnt have the reg unplugged, you have proved nothing.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#6
12-26-2010, 06:30 PM
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Similar problem for me on my 81 300sd. I have been having to operate the past few weeks with disconnecting the batt at every stop more than an hour or so. If i leave the batt connected it will eventually drain the battery. I have already replaced the voltage regulator. When the Alternator is unplugged the car operates normally. ALso with the alternator unplugged the gauges zero out and GP light operates normally. This is a 911 so help asap would be appriciated. Thank you
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81' 300SD AKA "Big Helga" 84' 300D Euro spec (Veronika) 85' 300D NonCalifornia (Heidi) "We shall not fail or falter; we shall not weaken or tire...Give us the tools and we will finish the job." -Winston Churchill, 1941 "I'll have a Chinchilla!"
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#7
12-26-2010, 07:48 PM
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First thing check all earths, it sounds like that is the problem. If they are all good, then start looking for a short down to earth. There are threads describing how to do that starting by removing fuses.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#8
12-29-2010, 03:53 AM
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My brother went through most of the fuses with a test light. We think we have narrowed the short to something in the alternator or something from the GP relay. As soon as i get some excess cash I am going to put a new alternator in.
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81' 300SD AKA "Big Helga" 84' 300D Euro spec (Veronika) 85' 300D NonCalifornia (Heidi) "We shall not fail or falter; we shall not weaken or tire...Give us the tools and we will finish the job." -Winston Churchill, 1941 "I'll have a Chinchilla!"
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#9
12-29-2010, 06:00 AM
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Resistor Pack is bad allowing voltage to feed back through system when ingintion is off
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o)
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#10
12-29-2010, 07:41 AM
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have you tried jiggling the key right before you pull it out of the switch....the light being on while the key is out would point me to the ignition switch.
Just another thought if you can't find a short anywhere. I dislike electrical problems.
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 77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)  83' 300SD, "The Superdon" 325k+ @ 28mpg 95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg 95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head  99 Suzuki Intruder "Trudy" @ 45 mpg
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#11
12-29-2010, 01:24 PM
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Quote:
But the light is still on with regulator removed - that suggests something else. I think battery is applied to the alternator light, through a resistor then to the alternator field. So it depends if it goes to the field via the regulator, or just straight to the brushes, by-passing the regulator. A way to test that would be to remove the regulator on a normally running car, and see if the battery light still goes on when key is switched on.
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1983 300SD with bad undercarriage rust, with old greasecar 2-tank conversion. About 200K miles, just an adolescent but with premature bone disease.
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#12
12-30-2010, 07:46 PM
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At paddo, The light turns off when the alternator is removed, have replaced the voltage regulator already, I thought it was the Ignition switch as well, but i don't think that is it.
Does anyone have a wiring diagram for these beasts?
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81' 300SD AKA "Big Helga" 84' 300D Euro spec (Veronika) 85' 300D NonCalifornia (Heidi) "We shall not fail or falter; we shall not weaken or tire...Give us the tools and we will finish the job." -Winston Churchill, 1941 "I'll have a Chinchilla!"
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#13
01-05-2011, 09:32 PM
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Update for my car: the alternator was Toast, got it rebuilt and its been working fine since, these cars have some wacky electrical systems.
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81' 300SD AKA "Big Helga" 84' 300D Euro spec (Veronika) 85' 300D NonCalifornia (Heidi) "We shall not fail or falter; we shall not weaken or tire...Give us the tools and we will finish the job." -Winston Churchill, 1941 "I'll have a Chinchilla!"
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