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.Duty & taxes paid at delivery

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚡ Drive with confidence—power, speed, and protection in one sleek relay!

COMPACT EFFICIENT - Small footprint with low power consumption, perfect for tight engine bays and high-sensitivity circuits.
DURABILITY THAT LASTS - Engineered for 100,000 electrical cycles and 10 million mechanical operations—reliability you can trust.
POWERHOUSE PERFORMANCE - Handles up to 40A at 12V DC for robust automotive applications.
BUILT IN VOLTAGE SHIELD - Integrated diode suppresses harmful voltage spikes, protecting your vehicle’s electronics.
LIGHTNING FAST SWITCHING - Operate and release times under 15ms ensure instant response.

The Gebildet JD1912 4-pin 12V 40A relay harness combines high current capacity with ultra-fast switching and built-in diode protection. Designed for automotive, truck, motorcycle, and boat applications, it offers exceptional durability with up to 100,000 electrical cycles and a compact design that fits seamlessly into any 12V system. Trusted by professionals for reliable, efficient performance under extreme conditions.

Specifications

ASIN	B07BK4DBPB
Best Sellers Rank	1,396 in Automotive ( See Top 100 in Automotive ) 2 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 459 Reviews
Manufacturer	Gebildet
Manufacturer Part Number	DE127
Minimum Switching Voltage	8 Volts (DC)
Model Number	1
Mounting Type	Wall Mount
Mounting type	Wall Mount
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

E**.

Bien

Qualité suffisante, fonctionne

16.08.2026

J**N

Good relays!

Relay are working well and can be used with or without mounting plate.

6.11.2020

B**O

Buona qualità, ottimo prezzo

Relè di buona qualità ad un prezzo ottimo.

2.08.2025

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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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

Reviews

Common Questions