|
|
|
#1
|
||||
|
||||
Battery Light stays on.
Howdy,last night as I was coming home the battery light came on briefly at low speed but then went off when I went faster.When I got home and shut it off the battery light stayed on.Checked the fuse box to see if anything was weird and found the C fuse had blown,replaced it but the light stayed on.Called the mechanic today and he said alternator,I asked about maybe voltage reg and he said the light would go off if that was it but it stays on if its the alternator.Any suggestion ,hints info on this.I have not checked how much its charging but when you start it up the light goes off.Thanks
|
#2
|
||||
|
||||
Quote:
__________________
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 |
#3
|
||||
|
||||
Most parts shops will have a tester that can be used while the alternator is in the car. Stop by and have it tested, if you can.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#4
|
||||
|
||||
If you're bored, you can pull the regulator and check the brushes.
My light had come on dimly, and would sometimes go out for 10-20 mins. On the end of the second day, the light stayed on. Had to get a jump to get home. Lucky for me, I had a spare alternator - "borrowed" the brushes from it, and all was well again PS: I think they are flathead screws, and the one will need a stubby to get to it. An easy test for alternaters....take a screwdriver, and hold it against the center of the back of the alternator...you should feel a slight magnetic pull if it is good.
__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D |
#5
|
|||
|
|||
I had one where the light would come on when I took the key out of the ignition. It turned out to be a shouted diode in the rectifier.
|
#6
|
|||
|
|||
Had same problem last friday
Just had the same problem last friday on the 300SD. It was the alternator. Easiest way to check is to use a voltmeter. Check battery voltage with the car not running. A fully charged battery should be around 12.8VDC. Anything less means the battery is not fully charged. Anyway, with the car running the battery voltage should be around 13.1~13.8VDC meaning the alternator and voltage regulator are working fine. If the battery voltage remains the same as when the car was off than the alternator is bad. Not worth the time to try to tell if its the voltage regulator or brushes, just replace the alternator. About $75 at Schucks, unless you have a spare lying around and nothing else to do. Also check for tight and clean connection at the battery posts and all other electrical connections. Not rocket science, just basic electrical troubleshooting. SKI
__________________
Ski "Love them diesels" 63 190D (sold) 84 300SD 97 Dodge Cummins 97 HD FLSTC(if Harley made a diesel I'd have one) |
#7
|
||||
|
||||
I agree with Larry, It usually 90% of the time the brushes on the regulator are shot. Just replace the regulator. You don't even have to pull the alt on a 300 or 240.
__________________
My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle. |
#8
|
||||
|
||||
Be very careful, there are spinning belts in that area and you don't want to get the screwdriver caught in the alternator.
__________________
Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section |
#9
|
||||
|
||||
Quote:
Do not do this. The regulator uses battery voltage regulate the voltage out to the vehicle and you can spike / burnout all the electronics in your car doing this. There is a reason why there is a tag on new alternators that say to have to fully charged battery before instal.
__________________
Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|