SYMBOLDESCRIPTION6Generator7Wiper Motor Lead8Engine Temp. Switch Lead9Bulkhead Connector Lead10Shield11Knock Sensor12Oil Pressure Sensor13Junction Block Cover14Distributor15Coolant Temp. Switch16A/C Compressor17Harness Ground42Oil Pressure Sensor (With Gages) Chevrolet 1500 Truck 4.3 1990 Electrical Circuit Symbol Map