Harness for 4-headlights, 4-on low, 4-on high

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unfortunately

Member - Posts: 6

Joined: February 11, 2018

Posted: February 11, 2018 at 2:51 PM / IP Logged

Hello,

I have a 1989 Toyota LandCruiser, the model with 4 headlights. It's a 24v model (yes, even the headlights), but I don't think that that will affect the design of the harness. Toyota headlights operate on a switched-ground system. I'd like to revers that to switched power. Current configuration is H1 highs and H4 lows. I'd like to build a harness that allows for all 4 lights to be on during low-beam operation and all 4 lights to be on during high beam operation. I have two Bosch 5-pin relays, and a couple of old harnesses from other projects that I can hack up and repurpose here. However, I'm having trouble wrapping my head around how to configure the harness and relays to achieve what I'm after. Any chance anyone has an idea of how to do this?

Cheers

unfortunately

Member - Posts: 6

Joined: February 11, 2018

Posted: February 11, 2018 at 5:16 PM / IP Logged

Harness for 4-headlights, 4-on low, 4-on high -- posted image.

This is how i've got it imagined. Does that look right?

The lights being installed are LED and can operate in a 9v-32v range. Simplicity and cleanliness of wiring dictates that I'll run them from the balanced 12v fuse block instead of 24v off the high side battery.

unfortunately

Member - Posts: 6

Joined: February 11, 2018

Posted: February 11, 2018 at 5:18 PM / IP Logged

I based this off of the diagram here: https://www.the12volt.com/relays/relaydiagram8.html

unfortunately

Member - Posts: 6

Joined: February 11, 2018

Posted: February 11, 2018 at 6:16 PM / IP Logged

Updated for cleanliness & efficiency.

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: February 12, 2018 at 10:18 AM / IP Logged

Your diagram looks good to me for switching 12V+ to each light during high and low.

the12volt • Support the12volt.com

unfortunately

Member - Posts: 6

Joined: February 11, 2018

Posted: February 13, 2018 at 10:55 AM / IP Logged

Thanks for having a look. Now to build the harness and wire it up. I'm not super confident in my electrical skills, I appreciate the extra set of eyes on my diagram.

unfortunately

Member - Posts: 6

Joined: February 11, 2018

Posted: February 21, 2018 at 9:54 PM / IP Logged

Thanks again, I got the harness built and my new headlights working as expected. Cheers!

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: February 22, 2018 at 8:11 AM / IP Logged

You're welcome. Happy to hear you have it working.

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