whats up with this new problem
went to start the car 83 300sd today
no juice so charged the battery
it starts fine but battery light is ON
and stays on after the motor is OFF
checked for a door cracked open or other lights on
thats not happening
why is the battery light on???

fried alternator

great!!!

any one found a made in USA UNIT THAT FITS???
AS THEY ARE ABOUT 1/4 THE COST FOR MORE OUTPUT!!!!

There's a bridged diode in the alternator. Take it to the local electrical repair shop.

Made in the USA? That probably eliminates Chrysler, Ford, and GM. Toyota might make their own here LOL!

__________________

Gone to the dark side

- Jeff

I agree with regulator diodes, failed letting it backfeed itself to dead. Should be a replaceable part. Pending the mileage on it, you might be well off to just get an alternator rebuild kit (bearings, brushes, brush springs, regulator) and fix it up like new again, much cheaper option than a new or rebuilt.

__________________
Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale

I got a remanufactured, in USA, Bosch, so they said. Came with regulator, not the other thing, diode? $65.00 May only have needed new bearing, don't have facilities to work on it.

__________________
83 SD

84 CD

The diodes should be an internal part of the regulator bridge rectifier is another way of saying 4 doides hooked up in a way to convert ac to dc voltage, and there is some small electronics involved for maintaining a regulated voltage. Old style early cars had external relay type regulators (way back when) later they had solid state regulators, still externally mounted, and the rectifying diodes were large plug looking things in the rear of the alternator. Modern units are completely contained within the alternator, and usually resemble a ceramic block of sorts with a heat sink built into it inside the alt, and rectifying/regulation are all performed together in the same unit.

__________________
Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale

It's the backout diode - CHEAP FIX

Diodes are easy to check. You will read either continuity or no continuity. Now reverse the wires to your meter - you MUST read the OPPOSITE of what you just read. If you read continuity before, now you must see no continuity. Any one of the diodes that reads the same both ways is bad. Continuity - continuity means the diode is shorted, no continuity - no continuity means it is open. Replace as needed.

__________________
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)