relay to hid kit

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=105564
Printed Date: July 15, 2025 at 5:45 AM

Topic: relay to hid kit

Posted By: m_canedo
Subject: relay to hid kit
Date Posted: June 18, 2008 at 5:03 PM

Im running a hid kit with a H4Hi and low bulb. i dont think my car gives a consistent 12v to the headlights. it varies between 9-11.6v. how can i draw the complete 12v using a relay? please help. thank you ahead of time.

Replies:

Posted By: i am an idiot
Date Posted: June 18, 2008 at 8:15 PM

Wire the relay as follows. Ground terminal 85, Your original 12 volt headlight wire to terminal 86. 12volt wire from the battery via a 20 amp fuse at the battery to terminal 30. The wire to your HID lights to terminal 87.

The above is assuming the new lights pull less than 20 amps. If less than 20 a 10 AWG wire should be fine. If they pull more than 20 amps, you will need to use 2 relays one per each side of the car.

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