The 2-headlights h4 headlight relay harness can be installed in 2 pcs H4 plug headlamps, such as 7x6 led headlights,7inch Round headlight. Solve problems Such as unworkable Headlight,Dim Headlights, Flickering Headlights, Back Feeding Power, Malfunctioning Headlights when using Hi/Low Beams etc.
Built-in two durable relays, high-temperature ceramic headlight sockets, can well proect the car circuit if there is any abnormal situation occur.
Can be installed in vehicle with 4x6/7X6/5x6 Led rectangle headlight,7Inch Round headlight which with H4 plug.If your truck is for toyota, suzuki samurai etc,it will be much useful for you
1 set relay wire harness can support 2 headlight.Pre-wiring Plug and Play. No need to modify the spare line at all.Very easy to be installed
Working voltage is 12v, this headlight relay harness can't use 24v voltage.