Nilight 50003R 12V 5-Pin SPDT Relay Harness Set, 5-Pack

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Product guide

Nilight 50003R 12V 5-Pin SPDT Relay Harness Set, 5-Pack

Pack: Nilight 50003R is a five-piece automotive relay and harness set with 5-pin SPDT relays, 12-volt coils, and interlocking sockets. The listing describes the set for 12V automotive accessories, while its stated current capacity and wiring details are worth matching to your installation before use.

At a glance

Five relays and five wired sockets are described, with an interlocking male-female connection design.
The listing specifies separate normally open and normally closed capacities, rather than one identical rating for both paths.
Color-coded wire descriptions map five pin positions to accessory, switch, positive, and ground connections.

Price

$12.14Save 10%

Reference price: ~~$13.50~~

Price checked: Nov 13, 2026

View offer

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Pros and cons

Pros

A five-set quantity can supply relays and sockets for multiple circuits or replacements.
The included wiring harness sockets and listed wire color assignments can simplify identifying relay connections.
SPDT contacts provide normally open and normally closed paths for compatible 12V automotive circuits.

Technical specifications

21 specifications

Identity
Brand	Nilight
Model	50003R
Part number	NI-RE05

Electrical
Coil voltage	12 volts
Contact type	Spdt
Current rating	40 A
Maximum switching current	40A.
Normally open capacity	-NO 40A 14VDC.
Normally closed capacity	-NC 30A 14VDC.
Maximum switching voltage	30V DC.
Maximum switching power	560W.
Contact material	Silver Copper
Coil resistance	50 milliohms

Connection and installation
Connector type	Plug-In
Mounting type listed	Surface Mount
Wiring color assignments	PIN87 Yellow (To Light/Accessory), PIN 87a Red.
Additional wiring color assignments	PIN86 White (To Switch), PIN30 Blue (Positive), PIN85 Black (Ground).

Physical and operating details
Weight listed	8 ounces
Upper temperature rating	125 °C
Operation mode	Automatic
Specification met	UL

What to know before buying

Listing details to confirm

The listing is inconsistent about switching ratings: it gives 40A/14V DC normally open and 30A/14V DC normally closed capacities, while a separate specification gives 40 A, a 30V DC maximum voltage, and 560W. Confirm the relevant rating for your circuit. Coil resistance is listed as 50 milliohms, while the product description labels 50mΩ as contact resistance, so the resistance specification is unconfirmed. The details also list UL, without clarifying the certification scope. Verify electrical compatibility and wire suitability for the intended load.

What’s in the box

Included

5 relays and 5 relay sockets with wires

Who is it for?

A good fit for

Automotive accessory wiring projects using compatible 12V circuits and 5-pin SPDT relays.
Buyers seeking multiple relay-and-socket sets with an interlocking socket design.

Less suited to

Installations that require a stated wire gauge, waterproofing, or a clearly confirmed certification, since these details are not established in the supplied listing.

Nilight 50003R 12V 5-Pin SPDT Relay Harness Set, 5-Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 3,431 ratings

5 stars79%79%
4 stars13%13%
3 stars5%5%
2 stars1%1%
1 star2%2%

Customer feedback reports positive impressions of quality, value, and ease of installation, with use across cars, boats, and motorcycles mentioned. Durability and stability are mixed, and some customers report loose harness connections or wires they consider too small. For buyers, these concerns matter when the installation depends on secure connections or a particular wire gauge. The listing does not state the gauge, so assess that requirement separately.

Positive themes

Customers describe the relays as good value and easy to install.
Some customer feedback describes the product as suitable for varied vehicle applications.

Negative themes

Some customers report loose harness connections.
Some customers say the wires are too small gauge.

Mixed feedback

Durability and stability receive mixed customer feedback.

Frequently asked questions

How many relays and sockets are described?

The listing says the package includes five relays and five relay sockets with wires.

What are the listed normally open and normally closed ratings?

The described capacities are 40A at 14V DC for normally open and 30A at 14V DC for normally closed. Other listed maximum ratings do not align fully, so confirm suitability for the specific load.

Does the listing specify wire gauge?

No wire gauge is stated in the supplied details. Customer feedback also includes mixed comments about wire size, so check this before choosing it for a load-sensitive installation.