CALIFORNIA Models

With engine off and ignition turned on, check for presence of battery voltage at mixture heater harness connector, between terminal C and ground. If no battery voltage is present, check water temperature switch and mixture heater relay.

Fig 1: Mixture Heating System 1986 1/2 Pickup models are similar to 1986 models.

Check for continuity between terminals of water temperature switch at connector. Check mixture heater relay. If necessary, check wiring harness and automatic choke relay.

Fig 2: Mixture Heater & Carburetor Insulator Assembly