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jackal342 
Member - Posts: 3
Member spacespace
Joined: May 29, 2009
Location: Minnesota, United States
Posted: May 29, 2009 at 3:21 PM / IP Logged  
Ok, so I'm kind of lost. I have a 4 prong relay (it has 86,87,85,and 30/51 on the diagram on the back) I want to have my car run the low beams normally, but when the high beams are turned on I want the low beams to come on with them too. (Right now when you turn on the high beams the low beams turn off). How should I wire this? A friend told me to put the high beams on 86 (switched) the lows on 30/51 (load) the ground is 85 and the constant is 87. Do I need to run a constant for the lights? I'm so confused.... Any help would be great. Thanks guys.
i am an idiot 
Platinum - Posts: 13,674
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: May 29, 2009 at 7:04 PM / IP Logged  

You can not do it with the relay you have, you need a Single Pole Double Throw relay, you have a Single Pole Single Throw device.

You need to cut the wire that now feeds your low beam lamp.  Connect the vehicle end of that wire to terminal 87A of the relay.  Connect the lamp to terminal 30.   Terminal 87 needs to be connected to the battery.

lighting relay - Page 2 -- posted image.

jackal342 
Member - Posts: 3
Member spacespace
Joined: May 29, 2009
Location: Minnesota, United States
Posted: May 29, 2009 at 10:39 PM / IP Logged  
Thanks a lot! I'll go get the new ones tomorrow! You have helped me so much! Thanks again!
dualsport 
Silver - Posts: 983
Silver spacespace
Joined: September 27, 2005
Location: United States
Posted: May 30, 2009 at 2:41 AM / IP Logged  
Was there a problem wiring it as described by your friend using the high beam to control the relay and switching the constant power to the low beam? You'd only be tapping into the low beam in parallel with its original power rather than opening up the connection.
It would then apply power to the low beam through your added relay when the high beams are on, but do nothing when the high beams are off.
You'd need the SPDT only if you need to maintain isolation from the low beam power feed for some other reason.
jackal342 
Member - Posts: 3
Member spacespace
Joined: May 29, 2009
Location: Minnesota, United States
Posted: May 30, 2009 at 11:26 AM / IP Logged  
I didn't wire it up at all because I wasn't too sure if he had it right. But thats how I want them to run. I just want them to run normal when in low beam mode, but when the high beams are on I wanted the lows to come on too. See what I did was I had a 1997 firebird that used a single headlight for both high and low beams so when you went from low to high the lows would turn off and the highs would turn on. But I changed out the front end of the firebird to the 98-02 front. That front end has two lights one high and one low. The true 98-02s have it so when you turn on the high beams the lows stay on too. Someone told me to replace my headlight control module and that would change it, but that didn't work at all lol. It just made it do the exact same thing. So next I moved on to the idea of adding a relay and my friend picked this one up for me. But I just wanted to confirm that he had it right before doing it. Thanks a lot!
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