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Buick Somerset Regal Fog Light Relays

Buick Somerset Regal Fog light relays

Starting at $27.95, AutoBuffy stocks 1 fog light relays from Standard Ignition to fit your Buick Somerset Regal. The fog light relay is an electrically switched component that routes power from the fuse box to your fog lights on demand. When it fails, your fog lights stop responding entirely or behave erratically — leaving you without low-level illumination in rain, fog, or snow when you need it most.

Signs your Buick Somerset Regal needs a new fog light relay

  • Fog lights do not turn on at all when the switch is activated, even with a known-good bulb and fuse in place
  • Fog lights come on intermittently or flicker without any input from the switch
  • You can hear a rapid clicking or chattering sound from the relay box area when the fog light switch is toggled
  • Fog lights stay on continuously after the switch is turned off and the vehicle is shut down
  • A burned or acrid smell near the fuse/relay box, indicating the relay contacts are overheating or arcing
  • Fog light fuse blows repeatedly, which can result from a shorted relay drawing excess current through the circuit

Which fog light relay should you buy for your Buick Somerset Regal?

Fog light relays are typically standard 4-pin or 5-pin automotive relays, but the correct amperage rating, footprint, and connector configuration must match your Buick Somerset Regal's wiring harness. The main decision is whether to buy an OE-equivalent direct-fit relay for straightforward plug-in replacement or a universal relay that requires basic wiring. Quality of the internal contacts matters — cheap relays with weak contacts fail quickly under repeated switching cycles.

OE Direct-Fit Relay
Best for
Owners who want a plug-and-play replacement with no wiring
What you get
Exact connector, amperage rating, and mounting tab matched to your Buick Somerset Regal's relay box
OEM / Dealer-Sourced Relay
Best for
Owners who want factory-spec reliability and have a warranty concern
What you get
Manufacturer-specified part with guaranteed fit, typically at a higher price point
Universal 4-Pin Relay (30A)
Best for
Budget-conscious owners comfortable with basic wiring
What you get
Generic relay that fits most standard fog light circuits; may require spade terminal adapters
Heavy-Duty 5-Pin Relay
Best for
Vehicles running upgraded or aftermarket high-draw fog lights
What you get
Extra normally-closed contact pin allows more complex switching logic; rated for higher continuous current

Fog light relays brands we stock for your Buick Somerset Regal

Standard Ignition
1 option · from $27.95

Replacing the fog light relay on a Buick Somerset Regal

Easy⏱ 15–30 minutesOwner's manual or fuse box diagram (to identify correct relay position)Relay puller tool or small flathead screwdriverMultimeter (for circuit verification)Flashlight or work light

Open the fuse and relay box, identify the fog light relay using the lid diagram or owner's manual, and use a relay puller or small flathead screwdriver to extract it straight up from its socket. Press the new relay firmly into the same socket until it seats fully, then test the fog lights before reinstalling the box cover. No special torque or calibration is required — this is a straightforward swap that most owners can complete in a single short session.

Frequently asked questions

How much does it cost to replace fog light relays on a Buick Somerset Regal?
Parts start at $27.95 on AutoBuffy. The relay itself is inexpensive, and because the job typically involves pulling the old relay and pressing in a new one, labor at a shop is minimal — usually under an hour of billed time. Total cost is generally low compared to most electrical repairs.
How do I know if it's the fog light relay or the fuse that's causing my Buick Somerset Regal's fog lights to fail?
Check the fuse first — a blown fuse is the most common cause and takes seconds to inspect. If the fuse is intact, swap the fog light relay with an identical relay from another circuit in the same box. If the fog lights work with the swapped relay, the original relay has failed and needs replacement.
Can a bad fog light relay drain the battery on a Buick Somerset Regal?
Yes, in some failure modes. A relay with welded or stuck-closed contacts can leave the fog lights powered even after the ignition is off. If your fog lights are staying on when they shouldn't, disconnect the relay immediately and replace it — continuous fog light draw will deplete the battery overnight.
Are fog light relays vehicle-specific or universal for a Buick Somerset Regal?
Many fog light relays use a standard automotive relay footprint, but the amperage rating and connector type must match your Buick Somerset Regal's specifications. Using a relay with too low an amperage rating can cause it to overheat and fail prematurely. Always verify the pin count, amperage, and connector style before purchasing.
Where is the fog light relay located on a Buick Somerset Regal?
The fog light relay is almost always located in the under-hood fuse and relay box or, on some vehicles, in a secondary fuse panel inside the cabin. Consult your owner's manual fuse diagram for the exact position. The relay is typically labeled 'FOG' or 'FOG LT' on the inside of the box cover.
How long does a fog light relay last on a Buick Somerset Regal?
Fog light relays are rated for a large number of switching cycles and often last the life of the vehicle under normal use. Failure is more common when the relay is exposed to moisture, corrosion, or heat, or when it is overloaded by aftermarket lights that draw more current than the relay is rated to handle.

Shop fog light relays by year for the Buick Somerset Regal

1985

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