1985-1992 Ford Ranger Relay Guide and Failure Symptoms
If your Ranger cranks but won't start, a simple, inexpensive relay could be the problem.
- A bad fuel pump or EEC relay is a very common cause of a no-start condition in 1985-1992 Ford Rangers.
- Symptoms include the engine cranking but not starting, sudden stalling, and not hearing the fuel pump prime.
- A quality aftermarket relay from a brand like ACDelco is a reliable and affordable repair for this vehicle.
- Replacing a relay is a simple, plug-and-play job that any owner can do in minutes with no tools.
Understanding Relays in Your First-Generation Ranger
Your 1985-1992 Ford Ranger relies on several small electrical switches called relays to power important parts of the truck. The most critical of these are the fuel pump relay and the EEC (Electronic Engine Control) power relay. When one of these fails, your truck will likely not start or will stall while driving. Other relays, like the horn relay, are less critical but still important for full vehicle function. Because these relays are often identical, you can sometimes swap them to diagnose a problem.
Common Symptoms of a Bad Relay
The symptoms you experience will depend entirely on which relay has failed. The fuel pump relay is the most common point of failure.
- Engine Cranks But Won't Start: This is the number one symptom of a bad fuel pump or EEC relay. The starter will turn the engine over, but without fuel or a signal from the computer, it will never fire up. You might notice you don't hear the familiar 2-second hum of the fuel pump from the gas tank when you first turn the key.
- Stalling While Driving: A relay that is failing intermittently can cut power to the fuel pump or computer suddenly, causing the engine to shut off while you're on the road. This can be a serious safety issue.
- Component Doesn't Work: For other relays, the symptom is more straightforward. A bad horn relay means the horn won't sound. A bad starter relay (often called a solenoid on these trucks) may result in a single click when you turn the key, with the engine not cranking at all.
Warning: Stalling Hazard
An engine that stalls unexpectedly can leave you without power steering and power brakes, increasing the risk of an accident. If you suspect a failing fuel pump relay, it's best to address the issue immediately.
Choosing the Right Aftermarket Relay
For a vehicle from this era, finding original Ford (OEM) parts can be difficult and expensive. Aftermarket parts are the go-to for most repairs. The key is to choose a brand with a reputation for quality electronics.
ACDelco Relays: ACDelco is a well-established brand with a long history of producing reliable automotive parts. While often associated with GM vehicles, their aftermarket components are widely used across many makes and models with good results. For a simple and critical part like a relay, an ACDelco replacement is a solid, cost-effective choice that you can trust to perform like the original.
Pro Tip: Quick Diagnosis
On many 1985-1992 Rangers, the fuel pump relay, EEC relay, and horn relay are the same part number and can be interchanged for testing. If your truck won't start, try swapping the horn relay into the fuel pump relay's socket. If the truck starts, you've found your bad relay. Just remember to buy a new one and not leave the horn relay in its place permanently.
Frequently Asked Questions (FAQ)
Where is the fuel pump relay located?
On most 1985-1992 Rangers, the fuel pump relay is located in a small black box in the engine compartment, usually on the driver's side near the firewall. This box also 🎬 Watch this video to see the fuel relay location. contains the EEC power relay.
Can I replace a relay myself?
Yes, this is one of the easiest repairs you can do. It requires no special tools. Simply locate the old relay, unplug it, and plug the new one in. It's as simple as changing a fuse.
My new relay failed quickly. What could be the cause?
A relay can fail prematurely if another component is drawing too much electrical current. For example, an old, worn-out fuel pump might draw more amps than the relay is designed to handle, causing it to burn out. If you have repeat relay failures, you should investigate the component that the relay powers.
Are there any recalls for relays on my Ranger?
A search of the NHTSA database shows no safety recalls specifically for relays on the 1985-1992 Ford Ranger. Recalls this old are rare and would likely have been addressed many years ago.
Helpful Videos
Technical Specifications
OEM Part Numbers: E9TZ-9345-A F0TZ-9345-A
Typically a green, 4 or 5-pin, 12V DC, 20-30 Amp cube-style relay.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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