DIESEL EXCESSIVE BATTERY DRAIN NEW FILTER INFORMATIOM

A CONDITION OF EXCESSIVE BATTERY DRAIN WITH THE ENGINE IDLING AND ACCESSORY LOADS (LIGHTS, DEFOG, ETC.) ON MAY BE CAUSED BY A NON- CHARGING ALTERNATOR. A LIMITED NUMBER OF EARLY 1984 MODEL VEHICLES MAY HAVE BEEN BUILT WITH AN INCORRECT "OIL AND CHECK ENGINE" LIGHT FILTER INSTALLED IN THE CLUSTER INSTEAD OF THE CORRECT "OIL AND BATTERY" FILTER. THESE WERE ONLY IN VEHICLES EQUIPPED WITH LF9 DIESEL ENGINE AND THE UD1 GAGE OPTION. THE BULB LOCATED IN THE "BATTERY" CAVITY MAY HAVE BEEN REMOVED IN ASSEMBLY. THIS BULB IS PART OF THE ALTERNATOR FIELD EXCITER CIRCUIT AND ITS ABSENCE RESULTS IN A NO ALTERNATOR OUTPUT CONDITION AT ENGINE SPEEDS OF LESS THAN APPROXIMATELY 2700 RPM. TO CORRECT A SUBJECT VEHICLE: 1. REMOVE THE INSTRUMENT PANEL TO GAIN ACCESS TO THE "CHECK ENGINE" LIGHT FILTER. 2. REMOVE "OIL AND CHECK ENGINE" FILTER, P/N 25053790 AND REPLACE WITH AN "OIL AND GEN" LIGHT FILTER, P/N 25021489. 3. INSTALL A NEW LAMP AND SOCKET ASSEMBLY, P/N 25015169. 4. REPLACE INSTRUMENT PANEL.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.