H4 (9003/HB2) Heavy Duty Relay & Headlight Wiring Harness Upgrade
Connect your vehicles headlight bulbs to FULL BATTERY VOLTAGE for MAXIMUM BRIGHTNESS!
At Aspire Auto Accessories, we manufacture and carry our own Heavy Duty Relay Harnesses that fit a wide selection of bulbs commonly found in most vehicles.
This relay and wiring harness upgrade is one of the most simple and effective ways to improve dim headlights and overall headlight performance by increasing both your low beam and high beam illumination. Perfect for dark roads, off-road, and rural areas!
Please Note:
➜ This kit is designed to fit vehicles equipped with H4 (9003 / HB2) bulbs.
➜ Daytime Running Lights (DRL) that utilize the low beam or high beam headlamps at a reduced intensity for illumination must be disabled in order to use this harness.
➜ This kit is designed to fit vehicles equipped with H4 9003 HB2 bulbs
➜ Gives you brighter low beam and high beam
➜ All connections are machine crimped and shrink wrapped to the highest industrial standards.
➜ Harness is covered with premium split-loom covering to protect wires
➜ High Temperature Connectors - Max Temperature = 572º F / 300º C
All connections are machine crimped and shrink wrapped to the highest industrial standards.
Why use a Heavy Duty Relay and Headlight Wiring Harness Upgrade?
➜ To minimize the VOLTAGE DROP in factory headlight systems. Voltage drop lowers the energy delivered to your headlight filaments which reduces their output. Voltage drop is a result of electrical power being run for long distances through thin wires. You can visualize voltage drop by imagining yourself drinking a beverage through a long thin straw (electric energy is the "beverage" and the wire is the "straw").
➜ Using a H4 (9003 / HB2) Heavy Duty Relay and Wiring Harness Upgrade reduces the current that is handled by the head light switch by a large margin. This reduction in current greatly increases the life of your head light switch.
ADDING A H4 (9003 / HB2) HEADLIGHT WIRING HARNESS & RELAY UPGRADE:
➜ Increases the power delivered to your head lights by minimizing the distance power must flow from battery to head lights AND by passing this power through thick, 14 Gauge or 12 Gauge USA made wire (Smaller Gauge = THICKER wire) with the highest quality copper conductor.
AFTER INSTALLING A H4 (9003 / HB2) HEADLIGHT WIRING HARNESS & RELAY UPGRADE:
➜ POWER flows from BATTERY to HEAD LIGHT SWITCH in passenger compartment. When head light switch is turned on, POWER flows back out into engine compartment and then ACTIVATES RELAYS on the wiring harness. The RELAYS then CONNECT the HEAD LIGHTS DIRECTLY to BATTERY through 14 Gauge or 12 Gauge wires.
➜ In simplified terms, the H4 (9003 / HB2) Heavy Duty Relay & Headlight Wiring Harness Upgrade is triggered by the head light switch and when triggered, the harness supplies power to the head lights through a more efficient path.
