high, low beam on at same time

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=132188
Printed Date: May 15, 2025 at 6:11 PM

Topic: high, low beam on at same time

Posted By: rj8a
Subject: high, low beam on at same time
Date Posted: September 13, 2012 at 10:49 PM

I have a 99 gmc and would like to hook up relays so that my low beams turn on with my high beams. Would like a diagram to show me how. Thank you.

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Rj8a

Replies:

Posted By: howie ll
Date Posted: September 14, 2012 at 1:51 AM

This shows a relay in column loom after hi-low switch.
Notes:-
a)Caution this shows POS (+) feed at the switch*, some vehicles, e.g. Toyota have NEG (-) switching, TEST.
b)You may require two relays, one for each side.
Here's the diagram.hi-lo_1.bmp
Parts:-
One standard relay Bosch/Tycho cube style 5 pins.
One diode 1N4004 across 85 and 86, band to 86.
Fuse 15, not 20 as shown,spur from hi beam to 86.
*By switch I assume your hi low switch and flasher are on the indicator stalk.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: rj8a
Date Posted: September 14, 2012 at 2:13 PM

Thank you. i will get back to you and post results.

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Rj8a

Posted By: rj8a
Date Posted: September 21, 2012 at 12:25 AM

This worked out Wonderful
, just as i wanted. thank you again.

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Rj8a

Posted By: howie ll
Date Posted: September 21, 2012 at 1:34 AM

Good, glad to be of help.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.