I see there is a connector in the picture that says "to headlamp socket" would that go into the original headlight socket? If so which side?

The black connector plugs into the female wiring socket that you removed from one of the headlights. The two yellow male terminals get plugged into the back of headlights. You will have to install the black connector into the headlight harness on the side nearest the battery. Mount the relays, battery feed and that side's ground strap in the same area. The long extension to the other headlight gets into the back of the headlight after you removed the terminal. Install that side's ground. That original female terminal that was on that headlight will no longer be used. Tape it up and secure out of the way.

Does this work with a 1986 Toyota pickup?

Yes it does I have it on my 88 4runner

Does this work on 2004 honda crv?

Probably don’t need it. This is for very old vehicles that Cannot regulate the amperage to the LEDs. If your LED lamps flicker when you install them, this should solve it though....... I think.

Will this relay kit work on a 1992 Dodge D-250 Diesel?

Sorry, the fitment said not fit your car.

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⚡ Illuminate smarter, drive safer — upgrade your ride’s lighting game!

DUAL BEAM CONTROL - Seamlessly switch between high and low beams for enhanced driving safety.
BUILT IN SAFETY FUSE - Integrated fuse and dual waterproof relays protect your vehicle’s electrical system.
PLUG PLAY SIMPLICITY - Pre-wired harness requires zero modification—easy install, zero hassle.
STAY COOL UNDER PRESSURE - High heat resistant ceramic plugs prevent overheating and ensure durability.
POWER UP WITHOUT COMPROMISE - Supports up to 80A max input current for high wattage halogen upgrades.

The Partsam H4 9003 Headlight Relay Wiring Harness Kit is a premium upgrade designed for vehicles using H4/9003 and compatible headlight models. It supports high wattage halogen bulbs with a max input current of 80A, features high heat resistant ceramic plugs to prevent overheating, and includes dual waterproof relays with built-in fuses for enhanced electrical safety. Pre-wired for plug-and-play installation, this 2-meter harness eliminates flickering, dimming, and back feeding issues, making it an essential upgrade for Jeep Wrangler, Cherokee, Toyota Pickup, and other compatible vehicles.

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Manufacturer	Partsam
Brand	Partsam
Package Dimensions	18.11 x 11.61 x 7.49 cm; 308 g
Item model number	GTCV-0440275598
Manufacturer part number	GTCV-0440275598
Position	Rear
Bulb type	Xenon
Special Features	Can fit H4 headlight, and Jeep Wrangler YJ Cherokee XJ Trucks, Toyota Pickup etc., Can fit: H4/9003 conversions, H6054 H5054 H6054LL 6014 6052 6053 headlights
Lift type	Automatic
Voltage	12 Volts
Item Weight	308 g

Partsam H4 9003 Headlight Relay Wiring Harness Kit Dual High Low Beam Headlamp w/High Heat Ceramic Plugs

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