Headlight Relay Install - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 12-21-2006, 03:39 AM

Those of you that did the headlight relay install where did you mount your relays? Post pics if you got em.

Thanks

nandress · 12-21-2006, 03:44 AM

I don't have a picture, and couldn't get one to turn out very well if I tried, but if this explanation doesn't do you, let me know and I will try.

I mounted mine (along with two fan relays) on the back side of the core support on the driver side down by where the inner fender bolts to the core support. It was a tight fit, but it was out of the way. There was a flat spot that fit all four relays nicely.

**LockDoc** · 12-21-2006, 11:18 AM

skokie,

Check this thread out:

http://67-72chevytrucks.com/vboard/s...eadlight+relay

LockDoc

**John Fabris** · 12-21-2006, 11:52 AM

I too don't have a picture, but I mounted mine on the core support, behind the battery tray, and with the battery in place, you can't see them. I also made a plastic mounting the plate that all of the relays are screwed onto and then used one of the existing bolt holes on the core support to mount it.

skokie · 12-21-2006, 12:48 PM

John
How did you run your wires on yours?

**John Fabris** · 12-21-2006, 02:59 PM

I ran all of the wiring so that it looked like it was stock using the wire gutter along the top of the core support.

I will get some photos tonight when I get home....

skokie · 12-21-2006, 04:23 PM

Thanks John. I appreciate that.

Brad · 12-21-2006, 09:31 PM

Here's how I've mounted mine. Looks like a mess that I need to cleanup.

**John Fabris** · 12-22-2006, 12:44 AM

Here are the pictures of mine. They are hard to see, but hopefully you get the idea...

skokie · 12-22-2006, 12:47 AM

John
Yep I see those. Got some more questions for you. Is your wiring new? Also have you noticed if that wiring gets any hotter since you are pushing more through it?

skokie · 12-22-2006, 01:15 AM

For the heck of it I took my multi meter out and measured the voltage on the driver side headlight while on high beam I got 13 volt reading from it. And 14.10 out of the alternator. Also I did install a new headlight and engine wiring harness about 6 months ago and I noticed when I installed it that the wires seemed to be 1 guage thicker.

krue · 12-22-2006, 01:24 AM

I used the relay box out of a dodge dynasty and used the installed relays. I mounted it in place of the voltage regulator, it blends in well with the core support and has spots for 9 relays.

nandress · 12-22-2006, 02:31 AM

Quote:

Originally Posted by skokie

For the heck of it I took my multi meter out and measured the voltage on the driver side headlight while on high beam I got 13 volt reading from it. And 14.10 out of the alternator. Also I did install a new headlight and engine wiring harness about 6 months ago and I noticed when I installed it that the wires seemed to be 1 guage thicker.

Even when you have the relay you will still probably have about the same voltage drop across your high beam light. The biggest difference is that the juice is going directly to your lights and bypassing all that other stuff, which is beneficial when you are doing other stuff (besides measuring voltage drop across your high beam!) Most headlight relays would have 12 guage or bigger going to the power side of the relay because you will likely have a 30 Amp fuse. But it is more efficient, all the same.

**John Fabris** · 12-22-2006, 03:16 AM

skokie, I did use a new wiring harness, E-Z Wire, and instead of the wires from the lightswitch/high-lowbeam to the lights, those wires run to the new relays, and then I had to add new wires from the relays back to the lights.

I have not really tested whether they get hot or not... but I am running a bigger gauge wire from relays to the lights..

12-21-2006, 03:39 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Headlight Relay Install Those of you that did the headlight relay install where did you mount your relays? Post pics if you got em. Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

12-21-2006, 03:44 AM	#2
nandress Senior Member Join Date: Sep 2006 Location: Nevada Posts: 211	Re: Headlight Relay Install I don't have a picture, and couldn't get one to turn out very well if I tried, but if this explanation doesn't do you, let me know and I will try. I mounted mine (along with two fan relays) on the back side of the core support on the driver side down by where the inner fender bolts to the core support. It was a tight fit, but it was out of the way. There was a flat spot that fit all four relays nicely.

12-21-2006, 11:18 AM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,853	Re: Headlight Relay Install skokie, Check this thread out: http://67-72chevytrucks.com/vboard/s...eadlight+relay LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

12-21-2006, 11:52 AM	#4
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Headlight Relay Install I too don't have a picture, but I mounted mine on the core support, behind the battery tray, and with the battery in place, you can't see them. I also made a plastic mounting the plate that all of the relays are screwed onto and then used one of the existing bolt holes on the core support to mount it. __________________ John Fabris 67 C10 SWB

12-21-2006, 12:48 PM	#5
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Re: Headlight Relay Install John How did you run your wires on yours? __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

12-21-2006, 02:59 PM	#6
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Headlight Relay Install I ran all of the wiring so that it looked like it was stock using the wire gutter along the top of the core support. I will get some photos tonight when I get home.... __________________ John Fabris 67 C10 SWB

12-21-2006, 04:23 PM	#7
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Re: Headlight Relay Install Thanks John. I appreciate that. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

12-21-2006, 09:31 PM	#8
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	Re: Headlight Relay Install Here's how I've mounted mine. Looks like a mess that I need to cleanup. Attached Images __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

12-22-2006, 12:44 AM	#9
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Headlight Relay Install Here are the pictures of mine. They are hard to see, but hopefully you get the idea... __________________ John Fabris 67 C10 SWB Last edited by John Fabris; 12-22-2006 at 12:45 AM.

12-22-2006, 12:47 AM	#10
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Re: Headlight Relay Install John Yep I see those. Got some more questions for you. Is your wiring new? Also have you noticed if that wiring gets any hotter since you are pushing more through it? __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

12-22-2006, 01:15 AM	#11
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Re: Headlight Relay Install For the heck of it I took my multi meter out and measured the voltage on the driver side headlight while on high beam I got 13 volt reading from it. And 14.10 out of the alternator. Also I did install a new headlight and engine wiring harness about 6 months ago and I noticed when I installed it that the wires seemed to be 1 guage thicker. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

12-22-2006, 01:24 AM	#12
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Headlight Relay Install I used the relay box out of a dodge dynasty and used the installed relays. I mounted it in place of the voltage regulator, it blends in well with the core support and has spots for 9 relays. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-22-2006, 03:16 AM	#14
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Headlight Relay Install skokie, I did use a new wiring harness, E-Z Wire, and instead of the wires from the lightswitch/high-lowbeam to the lights, those wires run to the new relays, and then I had to add new wires from the relays back to the lights. I have not really tested whether they get hot or not... but I am running a bigger gauge wire from relays to the lights.. __________________ John Fabris 67 C10 SWB



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