97 silverado high & low beams at same time

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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=24667
Printed Date: May 13, 2025 at 9:42 PM

Topic: 97 silverado high & low beams at same time

Posted By: truck man
Subject: 97 silverado high & low beams at same time
Date Posted: January 15, 2004 at 10:48 PM

I have a 97 silverado and I am wanting both high and low beams on when switched to high beams I know that there is some kind of relay that can be purched for around $20.00 but can prob. do it myself Does anyone know what I need and the wiring diag. for this?

Replies:

Posted By: RufNUSD
Date Posted: January 16, 2004 at 12:27 AM

Not to discourage you from this but... I think there is a reason not to do this. HEAT! High amperage! Tremendously could decrease bulb life.

Usually HLs have 3 wires. Hi-lo-ground. Determine which is which. Once you identify take a relay and do the following.

86 hi
85 ground
30 fused 12v
87 lo beam
87a n/a

Do this for each bulb. Voila.

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Someone pass me that bottle.

Posted By: geepherder
Date Posted: January 16, 2004 at 10:48 AM

RufNUSD brings up a good point- heat is definitely a consideration. I know some trucks came with sealed beams and others came with composite headlights. Which do you have? If you have the sealed beams, this is not a good idea, but if you have the composite headlighs with replacable bulbs, give it a go. Just hook it up how RufNUSD said.

Posted By: Steveo_supremo
Date Posted: January 16, 2004 at 9:39 PM

I have done this, works great, you only have to do it on one side, doesn't matter which, and both sides will light up.

Posted By: truck man
Date Posted: January 17, 2004 at 7:00 PM

Does yours have daytime running lights also what kind of vehicle did you do this on?

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