Is this flasher realy on/off at all times once power is supplied to unit?

First of all it is not a flasher relay as does not have a timer installed inside it is a standard relay with normally closed or open contacts and when power supplied to it the contacts will operate depending on which tab you have wired to will make or break the supply to the device being powered I use for switching vac pumps on braking systems for locos on a small railway.

Is this a latching relay? Push a button to start, then push a button to stop?

noo. you don't have to push any button , it start automatically and stop automatically ,, ( by current )

Will it be able to switch a 36v main with a 12v signal input?

It's rated 12 volts so unlikely. Fine for car spot lights or in my case heated windscreen.

From what I know of relays, the diagram on this listing shows incorrect wiring. Can you confirm please?

Hello, the diagram on this listing shows is correct, pin85 and pin86 can connect battery and ground in reverse

Gebildet 4pcs Jd1912 Car Relay Harness 12v 40a 4 Pin

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

⚡ Drive Smart, Switch Fast, Stay Protected!

BUILT IN DIODE SHIELD - Protects your precious electronics from damaging voltage spikes—because your ride deserves the best defense.
SILVER ALLOY CONTACTS - Premium Ag alloy contacts guarantee ultra-low resistance (≤100mΩ) and long-lasting performance over 100,000 electrical cycles.
COMPACT VERSATILE FIT - Designed for seamless integration in cars, trucks, motorcycles, and boats with standard 12V DC systems—upgrade your gear without hassle.
LIGHTNING FAST SWITCHING - Operate and release times under 15ms keep your circuits responsive and reliable in every drive.
POWER THROUGH WITH 40 AMPS - Handles heavy-duty automotive loads effortlessly, ensuring your vehicle’s electrical system never skips a beat.

The Gebildet 4pcs JD1912 Car Relay Harness is a high-performance 12V 40A 4-pin SPST relay set featuring built-in diodes for voltage spike suppression, silver alloy contacts for durability, and ultra-fast switching times. Engineered for automotive, truck, motorcycle, and boat applications, it offers reliable operation across extreme temperatures and humidity, ensuring your vehicle’s electrical system runs smoothly and safely.

Specifications

ASIN	B07BK4DBPB
Best Sellers Rank	2,323 in Automotive ( See Top 100 in Automotive ) 3 in Car Relays
Brand	Gebildet
Coil Resistance	73.33 Ohms
Coil Voltage	1.8 Volts (DC)
Connector Type	4 Pin Terminal
Connector type	4 Pin Terminal
Contact Current Rating	40 Amps
Contact Material	Silver Alloy
Contact Type	Normally Open
Contact material	Silver Alloy
Contact type	Normally Open
Country Of Origin	China
Current Rating	40 Amps
Current rating	40 Amps
Customer Reviews	4.6 out of 5 stars 460 Reviews
Manufacturer	Gebildet
Manufacturer Part Number	DE127
Minimum Switching Voltage	8 Volts (DC)
Model Number	1
Mounting Type	Wall Mount
Mounting type	Wall Mount
Number of Items	4
Number of Packs	4
Operating Time	0.02 Seconds
Operation Mode	Electric
Release Time	0.01 Seconds
Specification Met	dc
UPC	646040294544
Wattage	1.8 watts

Reviews

S**W

Essential equipment.

Arrived on time. Easy to fit. Good value for money. Appears to be good quality.

7.12.2025

R**G

Nice

Does what it’s supposed to do

17.10.2025

M**G

Good

6.04.2025

K**N

relay

work well

13.01.2020

D**.

good quality, good value,

my starter and fuel cut off relays failed, on my Land Rover, replaced with this product, easy to wire up, excellent.

19.12.2019

S**E

Arrived on time

On time and al correct

9.01.2025

M**N

Car Relays

good value for money fery quick service

20.10.2020

W**S

Spot lights

Great lights as the ad said Delivered on time .Great to deal with

22.04.2020

A**R

Muy bien come se debe.

17.06.2026

W**E

Bra

Dem har vikt till sig och känns inte billigt gjorda

4.07.2022

M**S

TOP Qualität. Gerne Wieder.

9.09.2026

E**.

Bien

Qualité suffisante, fonctionne

16.08.2026

V**O

Bravo

Bene lo consiglio

28.01.2026

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¥3199

Duties & taxes included

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Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat

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Details

Description

Specifications

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Common Questions