Will this harness work with other bulb types?

This harness is specifically designed for H4 bulbs. Putco offers similar harnesses for other bulb types, including 9004, 9007, 9006, 9012, H13, and 9008.

Is this harness compatible with vehicles that have daytime running lights?

According to Putco, this harness is not intended for use with vehicles equipped with DRLs (daytime running lights). Using it in a DRL-equipped vehicle may cause issues with the lighting system.

Does this harness include wiring for turn signals or parking lights?

No, this harness only includes the necessary wiring for the headlights themselves. It does not include any additional wiring for turn signals or parking lights.

Putco H4 - 100W Heavy Duty Harness & Relay Wiring Harnesses

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Putco

Putco H4 - 100W Heavy Duty Harness & Relay Wiring Harnesses

Name: Putco H4 - 100W Heavy Duty Harness & Relay Wiring Harnesses
Brand: Putco
Price: 45.40 USD
Availability: InStock

$45.40

H4 heavy-duty harness and relay from Putco. Increases headlight output by bypassing the headlight switch.

Key Features

Relay — bypasses the headlight switch
Increases light output — pulls power directly from the battery
Heat-proof design — protects against high-wattage bulbs
Hard-insulated plastic plugs — durable construction

Designed for H4 bulbs. Check manufacturer fitment data to confirm compatibility with your vehicle.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more