Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM1977RAM WAGON B300, VAN PASSENGER EXTENDED, 7.2L ENG VIN DREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSELECTRIC ASSIST CHOKETESTINGCONTROL SWITCH TEST
1977 Dodge and Ram Ram Wagon B300, Van Passenger Extended, 7.2L Eng VIN D
Control Switch Test
1977 Dodge and Ram Ram Wagon B300, Van Passenger Extended, 7.2L Eng VIN DSECTION Control Switch Test
- Connect a test light between battery terminals. Note light intensity. Before starting engine, detach ignition harness electrical connector from heater control switch.
- Connect test light to load (choke) terminal of control switch and ground. Start engine and allow to reach normal operating temperature.
- Apply 12 volts to ignition harness terminal of control switch. If test light does not light or have same intensity as when connected to battery terminals, control switch is defective and must be replaced.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.