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

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

Help Track order

Account Cart

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

Help Track order

Account Cart

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

Product ID: 64439284

Details

Connector type
4 Pin Terminal
Contact material
Silver Alloy
Contact type
Normally Open
Current rating
40 Amps
Mounting type
Wall Mount

⚡40A high current capacity

🔋12V standard automotive voltage

⏱️Ultra-fast 15ms operate time

R529

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Description

🚗 Power up your drive with precision and protection!

DURABILITY THAT LASTS - 100,000 electrical cycles & 10 million mechanical ops—engineered for relentless performance.
SILVER ALLOY CONTACTS - Premium Ag alloy ensures ultra-low resistance (≤100mΩ) for reliable power flow.
BUILT IN DIODE PROTECTION - Safeguard your ride’s electronics from voltage spikes with integrated diode tech.
PLUG PLAY COMPATIBILITY - Seamlessly fits all 12V vehicles—cars, trucks, motorcycles, boats—no hassle installation.
ENERGY EFFICIENT COMPACT - Low 1.8W coil power with a sleek 4-pin design keeps your system lean and mean.

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 protection, silver alloy contacts for minimal resistance, and exceptional durability rated for 100,000 electrical and 10 million mechanical operations. Designed for universal compatibility across automotive, motorcycle, truck, and boat applications, it offers ultra-fast switching times (≤15ms operate, ≤10ms release) and energy-efficient operation at just 1.8W coil power.

Specifications

ASIN	B07BK4DBPB
Best Sellers Rank	1,320 in Automotive ( See Top 100 in Automotive ) 1 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
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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

R529

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

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

1 month ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

View all Trustpilot reviews