the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

Headlight Relay Switching, 1993 Chevrolet Blazer


Post ReplyPost New Topic
< Prev Topic Next Topic >
jsandry 
Member - Posts: 10
Member spacespace
Joined: June 03, 2017
Location: Wisconsin, United States
Posted: March 22, 2020 at 3:50 PM / IP Logged Link to Post Post Reply Quote jsandry
Hello everyone,
I have a 1993 Chevy blazer K1500 and I want to use relays for switching on/off for the headlights to get the high amp draw away from the switch. I also want the headlights to have all 4 lights on when on highbeam. All the big names sell kits to do 1 or the other but not both. My question, is there a DIY way to do this easily or is there a way to mod one of the aftermarket kits to do it easy and efficient. The only way I could think of doing it was to use the signal wire from the highbeam relay to run both relays while high beam was on and add a diode in the circuit to prevent a backfeed to the low beam signal, probably wrong.
Any ideas would be welcome. Thanks to everyone in advance.
i am an idiot 
Platinum - Posts: 13,250
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: March 22, 2020 at 7:43 PM / IP Logged Link to Post Post Reply Quote i am an idiot
This thread will get both on with high beam
The above will get the 4 lamps on when on high beam. It will not be any extra load on your switch. Nothing more than the high beams are currently putting on it.
Are you having trouble with switches? If so, which portion, High or Low?
jsandry 
Member - Posts: 10
Member spacespace
Joined: June 03, 2017
Location: Wisconsin, United States
Posted: March 22, 2020 at 10:14 PM / IP Logged Link to Post Post Reply Quote jsandry
Thanks for the reply. I am not having any load problems with the switch, just trying to avoid switch problems and throw more light down the road. I have a 1970 Chevy K10 and I purchased and installed a relay kit without any problems.
jsandry 
Member - Posts: 10
Member spacespace
Joined: June 03, 2017
Location: Wisconsin, United States
Posted: January 12, 2021 at 2:00 PM / IP Logged Link to Post Post Reply Quote jsandry
I finally got around to my headlight project on the Blazer. I bought a harness kit with 4 pin relays that takes the power away from the switch and directly from the battery, but it only operates the normal factory way with 2 lights for lo beam and 2 lights for hi beam. I want to make it operate with 2 lights on lo beam and all 4 lights when the hi beams are switched on. The harness was pretty easy to install but I ran into problems when I tried to modify the harness to get all four lights to come on when the hi beams are switched. I tried to wire a diode ( to prevent current back feed ) in series to pass a positive signal to switch the lo beam. The hi beam relay switch signal was wired directly and I put another wire and diode ( to prevent back feed ) in series over to the lo beam signal wire so both relays would switch on when the hi beams were activated. When all of this was installed it resulted in the lo beams not coming on at all and the hi beams working only when they were switched on.
     Am I wiring it wrong? Am I using the wrong diodes? Magic Beans? In my mind it would work perfectly, in the 12 volt world, not so much. HELP!
jsandry 
Member - Posts: 10
Member spacespace
Joined: June 03, 2017
Location: Wisconsin, United States
Posted: January 13, 2021 at 10:11 AM / IP Logged Link to Post Post Reply Quote jsandry
I finally got around to my headlight project on my 1993 K1500 Blazer. I bought a harness kit with 4 pin relays that takes the power away from the switch and directly from the battery, but it only operates the normal factory way with 2 lights for lo beam and 2 lights for hi beam. I want to make it operate with 2 lights on lo beam and all 4 lights when the hi beams are switched on. The harness was pretty easy to install but I ran into problems when I tried to modify the harness to get all four lights to come on when the hi beams are switched. I tried to wire a diode ( to prevent current back feed ) in series to pass a positive signal to switch the lo beam. The hi beam relay switch signal was wired directly and I put another wire and diode ( to prevent back feed ) in series over to the lo beam signal wire so both relays would switch on when the hi beams were activated. When all of this was installed it resulted in the lo beams not coming on at all and the hi beams working only when they were switched on.
     Am I wiring it wrong? Am I using the wrong diodes? Magic Beans? In my mind it would work perfectly, in the 12 volt world, not so much. HELP!
geepherder 
Platinum - Posts: 3,574
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: January 14, 2021 at 3:52 AM / IP Logged Link to Post Post Reply Quote geepherder
Can you post a picture or drawing of how you have your relays/diodes connected?
My ex once told me I have a perfect face for radio.
jsandry 
Member - Posts: 10
Member spacespace
Joined: June 03, 2017
Location: Wisconsin, United States
Posted: January 14, 2021 at 9:03 AM / IP Logged Link to Post Post Reply Quote jsandry
Sorry for the crayon drawing. It's all that I could come up with. I am using 4001 diodes and I can't remember the brand name of the harness or relays ( super cheap either ebay or amazon ) I crimped and adhesive heat shrunk both ends of the diodes to 1/4" male disconnect terminals so they could be flipped in direction of current flow. The diodes were tested with a multimeter and they are ok. Headlight Relay Switching, 1993 Chevrolet Blazer -- posted image.
geepherder 
Platinum - Posts: 3,574
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: January 14, 2021 at 2:42 PM / IP Logged Link to Post Post Reply Quote geepherder
Looks good on paper. What voltage readings do you get when you backprobe the relay coils (leaving the relays connected) with low beams on/high beams on? Have you seen what happens if you swap relays?
My ex once told me I have a perfect face for radio.
jsandry 
Member - Posts: 10
Member spacespace
Joined: June 03, 2017
Location: Wisconsin, United States
Posted: January 14, 2021 at 8:49 PM / IP Logged Link to Post Post Reply Quote jsandry
I have switched the relays and it made no difference. If I recall correctly, I would get full +12v before the relay and less than 1 volt at the relay. I am going to work on it tomorrow and will have better numbers
geepherder 
Platinum - Posts: 3,574
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: January 15, 2021 at 6:02 AM / IP Logged Link to Post Post Reply Quote geepherder
Let me explain differently. If you put one meter probe on terminal 85 of the low beam relay and the other probe on 86, what voltage reading do you get when you turn on the low beams? What about the high beams?
Trying to picture your "before and at the relay" almost sounds like you reverse biased a zener diode.
My ex once told me I have a perfect face for radio.
Page of 2

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Monday, January 18, 2021 • Copyright © 1999-2021 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer