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.
Main Relay (Computer/Fuel System): Description and Operation
1985 Ford E 150 Van L6-300 4.9LSECTION Description and Operation
Fig. 12 EEC relay type, system application & relay locations:
EEC power relays are in parallel with ignition switch and provides power to the EEC module. Power relays also provide reverse battery protection and increased load handling to improve ignition switch reliability. Refer to Figs. 12 & 12a, for EEC-IV power relay type, location and model/engine applications.
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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.