If you're currently staring at a car that won't start or a blower motor that's suddenly gone silent, there's a good chance you're looking for a new fe246bh relay. These little plastic cubes are the unsung heroes of your vehicle's electrical system, handling the heavy lifting so your dashboard switches don't have to. It's one of those parts that you never really think about until it stops working, and suddenly, nothing else in the circuit seems to matter.
Electrical gremlins are arguably the most frustrating part of DIY maintenance. You can see a flat tire or hear a grinding brake pad, but a faulty relay often looks exactly the same as a brand-new one. If you've narrowed your diagnostic search down to the fe246bh relay, you're actually in a pretty good spot. It's a relatively cheap part, and replacing it is usually a five-minute job that doesn't require a degree in electrical engineering.
What does this little box actually do?
To understand why your fe246bh relay might be causing problems, it helps to know what it's doing in the first place. Think of it as a remote-controlled switch. Instead of running thick, heavy wires all the way from your battery to your dashboard switch and then back out to your headlights or fuel pump, the manufacturer uses a relay.
When you flip a switch in the cabin, it sends a tiny amount of electricity to the relay. This tiny current creates a magnetic field inside the fe246bh relay that pulls a physical metal contact closed. That closed contact then allows a much larger current to flow directly from the battery to the component. It keeps the high-amperage heat away from your delicate interior switches and allows for much more efficient wiring. If the internal coil snaps or the metal contacts get charred over time, the "bridge" won't close, and your component stays dead.
Where to look for the fe246bh relay
If you're hunting for this specific part, you'll most likely find it tucked away in the primary fuse box under the hood or in a secondary panel under the dashboard. Many Ford, Lincoln, and Mercury vehicles from a certain era rely heavily on the fe246bh relay for various functions.
Because it's a standard "multi-purpose" relay, it could be controlling anything from your A/C compressor clutch to your horn or your fuel pump. The best way to be sure is to check the diagram on the underside of your fuse box lid. Usually, there's a map that shows which square corresponds to which function. If you see "Fuel Pump" or "PCM" and the part number on the actual relay is fe246bh, you've found your target.
Signs that your relay has given up the ghost
Relays don't always die a quick, clean death. Sometimes they fail intermittently, which is enough to drive anyone crazy. One day the car starts fine; the next, it cranks and cranks but won't fire. Here are a few things to look out for if you suspect your fe246bh relay is on its way out.
The smell test and visual cues
Sometimes, you can literally smell a bad relay. If the internal components have shorted out, they'll produce a distinct "burnt electronics" aroma—that sharp, acrid smell of ozone and melting plastic. If you pull the fe246bh relay out and notice the plastic casing looks slightly discolored or warped near the pins, it's toast. Don't even bother testing it; just get a new one.
When the 'click' isn't enough
A classic trick for testing relays is to have someone turn the key while you put your finger on the relay. You should feel (and hear) a distinct click. That click is the physical arm moving inside the box. However, don't let a click fool you into thinking the relay is 100% healthy.
Sometimes, the internal contacts get "pitted" or covered in carbon deposits. The relay might click, meaning the magnet is working, but the electricity can't actually jump across the dirty metal contacts. It's like a bridge that lowers into place but is covered in ice—the connection is physically there, but nothing can cross it.
Testing the fe246bh relay with a multimeter
If you want to be absolutely sure before you spend money on a replacement, you can test the fe246bh relay with a basic multimeter. Most of these relays have four or five pins. You'll usually see numbers like 85, 86, 30, and 87 stamped near the pins.
- Check the Coil: Set your multimeter to Ohms (resistance). Touch your leads to pins 85 and 86. This is the circuit that activates the magnet. You should see some resistance (usually between 50 and 200 ohms). If it reads "OL" (Open Loop), the internal coil is broken, and the relay is dead.
- Check the Continuity: With no power applied, there should be no continuity between pins 30 and 87. If there is, the relay is stuck closed, which would explain why your battery keeps dying (because whatever the relay controls is staying on 24/7).
- The Bench Test: If you're feeling adventurous, you can apply 12v power from a battery to pins 85 and 86. You should hear that click. While the power is applied, check for continuity between pins 30 and 87. If the meter doesn't beep, the internal contacts are shot.
Buying a replacement: OEM vs. aftermarket
When it comes time to buy a new fe246bh relay, you'll have a choice. You can go to the dealership and get the official Motorcraft or OEM version, or you can grab a generic one from the local auto parts store.
Generally speaking, for something as critical as a fuel pump or ignition system, I usually lean toward OEM. It's a few dollars more, but the peace of mind is worth it. That said, the fe246bh relay is a pretty standard design. As long as the pin layout matches and the amperage rating is the same, an aftermarket version will get you back on the road just fine. Just make sure the replacement has the same diagram printed on the side—you don't want to accidentally put a "normally closed" relay into a "normally open" slot.
A quick word on safety before you start
I know it's just a little relay, but you're still messing with your car's electrical nervous system. Before you go pulling and poking at the fuse box, it's never a bad idea to disconnect the negative terminal of your battery. It prevents any accidental sparks or short circuits that could potentially fry more expensive components like your ECU.
Also, avoid the temptation to "bridge" the relay socket with a paperclip to see if the component turns on. While this is a common field diagnostic, if there's a short further down the line, that paperclip won't blow like a fuse—it'll just get red hot and potentially melt your entire fuse box. Stick to testing the fe246bh relay itself rather than bypassing it.
Wrapping it up
At the end of the day, a faulty fe246bh relay is one of the "better" problems to have. It's easy to access, simple to test, and doesn't cost an arm and a leg to fix. If your vehicle is acting up and the symptoms point toward an electrical failure, don't overlook these little black boxes.
Sometimes, the most complex-seeming engine problems have the simplest solutions. Swap out that old relay, make sure the connections are clean, and there's a very good chance your car will fire right back up. It beats a trip to the mechanic any day of the week.