Oil Indicator Does Not Light In Run
- Remove connector from oil pressure indicator relay. Place ignition switch in "RUN" position. Measure voltage between Tan wire and ground. If battery voltage is present go to step 2). If not, check Tan wire for an open.
- Measure voltage between Tan wire and Black wire. If battery voltage is present go to step 3). If not, check Black wire for an open.
- Measure voltage between Tan wire and Tan/Black wire. If zero volts are present replace oil light relay. If not, check for a shorted oil pressure sending unit or a short to ground in Tan/Black wire and Gray wire.
Courtesy of GENERAL MOTORS CORP.