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#1
12-04-2006, 03:03 PM
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Electrical Weirdness Attacks 300D
Been having a slew of electrical weird things happen since my alternator went out. Not just went out like died, but I put a DVM on the battery when it was running, and it read almost 17 volts. Enough damage was done to split the MB battery down the side. Now for the weirdness.
When I put on the blinker to turn left, the wipers go into intermittent mode. I was thinking the blinker stalk might be getting worn out. Well, not the stalk itself, but the switches in the column. To the right is fine. The temp gauge and the fuel gauge will jump about 3/8" for a few seconds, and then go back down. Usually when it does this, the seat belt warning light will illuminate. I hate weird electrical stuff.  Tonight I'm going to redo the ground, since those have been known to cause weird things to happen. 
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#2
12-04-2006, 04:10 PM
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Pull the instrument panel and trace the circuits. My odo reset arm fell off the odo and was jangling around in the panel shorting all kinds of things... Jumping gauges is usually bad ground circuit in the panel itself....
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#3
12-04-2006, 04:36 PM
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Over Voltage
1984 300d Turbo 141,000
Replace The Regulator $28.00 On The Rear Of Alternator Or New Alternator Diy, Overvoltage Need To Be Under 14.5 Volts Max
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#5
12-04-2006, 08:21 PM
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I've had the following things go wrong and caused electrical problems:
1. The instrument panel not being grounded. Was intermittent. Took a wire and grounded it. 2. Lots of voltage regulators gone bad 3. A wire between the alt and the battery wore down and the copper was exposed. Did a number on the battery and alt and VR. Blew through a couple of VR's before I found it. Hope you find it dp
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DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed 
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#6
12-04-2006, 08:32 PM
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Took an alternator off of my 82, and it's working fine. I have a VR on order for the other one.
Another reason I think the stalk is bad I found out tonight, when I hit the high beams, the wipers go into intermittent. The gauges were fine all the way home, and now that I think about it, when they jump it's when the temp gets over 100C. Still working on that one, I believe it's the water pump going. Tonight all the way home, it never got above 85.
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#7
12-04-2006, 11:15 PM
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Tony I just had the same thing happen on my friends 240 I had mentioned I got the alternator for. The original had coolant dripping on it and it seized once so we decided to replace it. I had put a new voltage requlator on it a year before, it was still working good. I had another alternator in the garage at home so I tried that first, swapped the pulley and VR to the other alt and put it in, it was charging...too much. 17+ volts. This was with the good voltage regulator on it. ran an alt test and it failed it. Thats why I went ahead and got the new replacement alternator.
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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