|
|
|
|
|
LinkBack | Thread Tools | Display Modes |
#31
|
|||
|
|||
By any chance, did you shut down with the battery cable loose or off? Is the engine ground strap loose, dirty or damaged?
When the engine shuts down, a powerful reverse current forms in the alternator coils. It dissipates into the battery if everything is in good shape. I think you'll find that there's a weak connection somewhere between the battery and the alternator. If so, the inductive kick would have nowhere to go, and the stator may be toast. What you need to do is clean and tighten the battery cables, including the battery ground at the point it bolts to the body. Also get under the car, find the engine ground strap and make sure the connection points are clean. Then take the alternator back and act outraged at having received a dud. |
#32
|
||||
|
||||
There's a heavy elec. load that should not be there. Probably glow plugs are after glowing when they should not be.
I doubt the alternator self destructed in such a short time.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#33
|
|||
|
|||
Yeah but the store clerks give you a funny look when you buy a quart of oil and a pair of ladies panty hose.
__________________
1998 E300 turbodiesel America's Rights and Freedoms Are Not The Enemy! |
#34
|
|||
|
|||
Quote:
Maybe I should've tried a new pair, but my friend's mom wouldn't cooperate! Happy Motoring, Mark
__________________
DrDKW |
#35
|
||||
|
||||
Quote:
There's no load that I noticed -- the battery voltage is stable at 12.04V on my multimeter whether or not the negative cable is connected (this is with the engine not running). It could be different with the ignition on. Revving the engine up to about 2000 rpm had no effect on charging -- all the dash lights stay on.
__________________
RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#36
|
||||
|
||||
Quote:
A self-excited alternator can run a vehicle without a battery connected with no ill effect provided that the load doesn't exceed its production capacity. I have personally started several cars without batteries using only jumper cables, then disconnecting and insulating the leads to move the vehicle and never had an alternator fail from that. If the alternator packed up from a loose connection it was due to arcing at the battery lead causing EMF spikes flashing back at the alternator, or it was a POS alternator to begin with. I'd strongly lean towards the latter. |
#37
|
||||
|
||||
This is what I'm thinking as well. I am just outside the return period, so I'm going to order another one from the same vendor and return it on that ticket. I've had really good luck with DB Electrical in the past (folks on the Saturn forums order them constantly), but even decent suppliers have bad parts occasionally.
__________________
RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#38
|
||||
|
||||
Quote:
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#39
|
||||
|
||||
Quote:
I tested voltage at the alternator terminal, and it is the same 11.8v that I read at the battery.
__________________
RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#40
|
||||
|
||||
Quote:
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#41
|
||||
|
||||
The lamp glows (and it didn't before the wire was connected). I revved the engine up, but it did not change the dash lights.
I'm going to go try again right now.
__________________
RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#42
|
|||
|
|||
I cannot help but notice that your alternator problem happened on 4/19 and you posted that it was a mechanical failure. How come it morphed to be an electrical problem? It does not make sense as alternator R&R is straight forward. You need to go back to square one and see what you have or have not done.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#43
|
||||
|
||||
Negative battery cable is disconnected:
The multimeter shows perfect continuity from the large alternator stud to the positive battery post. With the ignition on, there is 3.8 ohms of resistance from the small post to the positive battery terminal (from the charge indicator bulb). I'm going to go start the vehicle to see what the behavior this morning is with a fully cold alternator. I'll leave the DMM connected to the large stud to observe the charging (or total lack thereof) as the engine warms.
__________________
RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#44
|
||||
|
||||
The main stud mounting point is broken internally. Alternator was FUBAR on delivery.
__________________
RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#45
|
||||
|
||||
That'd do it. Did you over tighten the nut on the stud? That stud is on an insulator and the torque should be just tight enough so the nut will not undo itself. Probably not more than 1 to 2 ft/lb.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|