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
1986 Ford Aerostar V6-183 3.0LSECTION Description and Operation
There are two types of relays: the power relay and the time delay power relay. The time delay relay has a delay of 5 to 10 seconds and is used with an actuator assembly throttle control. Both relay types consist of a movable contact in the normally open position. All power relays (except time delay) have the same design with a different bracket attachment.
Function
EEC power relays are in parallel with the ignition switch and provide power to the EEC module. Power relays also provide reverse battery protection and increased load handling to improve ignition switch reliability.
RENDER: 1.0x
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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.