View Single Post
shogun shogun is offline
Registered User
 
shogun's Avatar
 
Join Date: Feb 2009
Location: Japan
Posts: 500
ETM's for E32 7 series E32 (1987 to 1993 7 Series) Wiring Diagrams
if the Alternator's field terminal goes open, then no current can flow through the idiot light lamp. The wiring diagram (Page 1230-00, -01) shows a resistor in parallel with the lamp at X16 pins 7 and 5, meaning that an open filament will not stop the field current. BMW engineers were not content to allow a blown idiot light filament to stop Alternator startup. This is a feature missing on 1990 GM cars, possibly.

So if one suspects an Alternator fault, onecan test this by sourcing some current via a 12V lamp into D100 Data Link Connector X6002 terminal 12. The pinout is shown at Page 8500-15
__________________
SHOGUN'S TRICKS AND TIPS FOR THE SEVEN SERIES
http://twrite.org/shogunnew/topmenu.html
Old 03-21-2017, 06:37 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)