SERVICE MANUAL UPDATE SEC. 8A ELECTRICAL SYSTEM DIAGNOSIS

SUBJECT: SERVICE MANUAL UPDATE TRAILER ADAPTOR WIRING DIAGRAM

MODELS/YEARS: 1990 CUSTOM CRUISER

Some 1990 Oldsmobile Custom Cruisers were produced with optional trailer adaptor wiring. The trailer adaptor wiring was not included in the 1990 Custom Cruiser Service Manual. For a circuit diagram and diagnosis of the trailer adaptor wiring for 1990, refer to the 1989 GM "B" Carline Service Manual, Section 8A-1 18-0 and-1 (Buick/Oldsmobile section of the manual).

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.