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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Buddy on June 18, 2011, 02:41:21 pm

Title: high and low beams
Post by: Buddy on June 18, 2011, 02:41:21 pm

I want to wire up my headlights so my high and low beams come on when I hit the high beams. I have tried this today with no luck. right now when I flick my highs on my lows go super dim. I know this is the way it is supposed to be but i do a ton of driving old country roads and i what to have super bright light out put. i thought it would be just a matter of running one wire from the sprae output on the bulb to the other low beam head light but that didnt work. I should also mention I am running a H4 bulb set up, i ditched my sealed bulbs long ago. so now my headlight is just a housing for the h4 bulbs for high and low beam.

Title: Re: high and low beams
Post by: VileZambonie on June 18, 2011, 02:49:38 pm

What year are we talking about and what set up do you have?

Title: Re: high and low beams
Post by: Buddy on June 18, 2011, 02:52:49 pm

sorry, I should have said that. I have a 1985. 4 headlights. like i said i dont have the sealed bulb tyoe i have the headlight that take a bulb.

Title: Re: high and low beams
Post by: 1979C20 on June 18, 2011, 03:02:15 pm

If you have h4 housings, go HID. I did, I love it. And to wire the highs and lows together, you have to use a relay. The power wire from the high beams needs to be rerouted to the "switch" spot on a relay, then the "switched" out put of the relay goes to the power spot on the High and Low beam bulbs. run the "Power" wire of the relay to the battery and the "ground" to any ground. All other wires on the bulbs stay. The low beams will have 2 wires going to the power spot.

Title: Re: high and low beams
Post by: Buddy on June 18, 2011, 03:06:30 pm

lol you lost me on that last one... I am not much of an electrical guru. I need it simple... real simple. tell me more about this HID conversion? how much did it cost, where did you get them etc, i just spent a far amount on all of the set up i have know so i dougbt i will switch. The PIAA bulbs i bought werent cheap.

Title: Re: high and low beams
Post by: VileZambonie on June 18, 2011, 10:06:14 pm

They should already be working like that.

Title: Re: high and low beams
Post by: Buddy on June 19, 2011, 01:08:14 am

they are some what when i turn on my high beams my low beams get so dim you cant even see them hardly

Title: Re: high and low beams
Post by: Edahall on June 19, 2011, 06:34:52 am

Here's some information.

http://www.rowand.net/Shop/Tech/WiringHeadlightRelays.htm

(http://www.rowand.net/Shop/Tech/images/HeadlightRelayWiringDiagram.jpg)