Relay wiring for Headlights??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jorgensensc · 02-24-2004, 03:00 PM

I can't seem to find the diagram I am looking for for the Headlight relay conversion. I am installing the H-4 conversion from Rick's (great product) and need to know exactly how many and which relays to use. I have a couple of relays that are 4 prong, do I need 2 for each ligh (hi/low)?? Or do I need to get the 5 prong with the 87a terminal and run the 87 terminal to one light and the 87a terminal to the other light and use a 2nd relay for highs? Thanks in advance for the info. I will be posting picks of the original lights and new lights installed with and without relays.
Also, does anyone know which relay to use so the interior dome light will fade out slowly (like newer vehicles) when the door is closed? Thanks in advance!

Thanks,
Shawn

Alex Hayley · 02-24-2004, 03:56 PM

Here is a link that was posted a week or two ago...
http://www.classictruckshop.com/club...ead/lights.htm

67chevemall · 02-24-2004, 04:40 PM

http://www.madelectrical.com/electri...adlights.shtml

This site is great@!

http://www.madelectrical.com/index.shtml

neonlarry · 02-24-2004, 05:02 PM

You need to use SPST relays either 4 or 5 terminal, 5 terminal just has two 87 terminals. The 87A terminal is on the SPDT relay. Use one relay for low beam one relay for high beam both lights to same relay. Go to this link and click on "Click here to view catalog page"for a terminal diagram.
http://order.waytekwire.com/CGI-BIN/...7D7B71+M37+ENG

jorgensensc · 02-24-2004, 06:17 PM

Thaks guys, that's what I'm looking for. Neonlarry, did you ever figure out the dome light dimmer relay??
Thanks again.
Shawn

neonlarry · 02-24-2004, 07:30 PM

No, I haven't figured out the dome light. Give me a couple of year, make and model with them and I'll see what I can find out . I'd like something like that also to go along with the wiper delay switch I'm putting in.

Longhorn Man · 02-24-2004, 08:05 PM

http://www.classictruckshop.com/club...ead/lights.htm
Good link, good drawings, good reading.

crazy4chevs · 02-24-2004, 10:44 PM

heres annother one.

neonlarry · 02-25-2004, 12:53 AM

Here is a link to a circuit diagram.
Most all the parts should be available at radio shack.

67chevytodd · 02-26-2004, 12:18 AM

I was able to find the relays at radio shack for $6 bucks a piece

1-PU70 · 02-26-2004, 01:13 PM

Call 1-866-866-1315 autothisworld I think that have the fading dome light I know they have the one touch up and down for power windows for $39.99. If they dont check some street rod mags. I know I saw it.

Brad · 03-07-2004, 03:58 AM

I finally got around to doing the headlight conversion on my truck today. I live in a big city with lots of street lights so it's kinda hard to tell the difference but I think there's a little more light now. I haven't had a chance to flip on the high beams and I'm curious how they will look now. Btw, if it's still not enough light after I readjust my lights, I've got a box with the H-4 style lamps with 85/100 watt beams!

I wanted to do this on my practice vehicle (my truck) before I do this to my Camaro. Not too difficult, just took about 1/2 a day and some connectors to make everything look stock.

Brad · 03-07-2004, 03:01 PM

here's another link headlight upgrade

71Shortbed · 02-22-2005, 09:19 PM

I got a dome light fader from Web Electric.

http://www.webelectricproducts.com/products.htm

It works great. Model DLD-1 Dome Light Dimmer Module. I installed it next to the fuse box and hooked into the dome light wiring right there. I also installed two under dash lights to light the footwells and hooked them in. Lights fade out in twenty seconds when the door is closed but go out instantly when the key is turned or the truck is running. I didn't have doorswitches so I installed them in the rubber bumper holes at the top of the doors... much easier to wire and no drilling.. Drilled out the bumper and it fit over the switch too.

Harry's 71 C-10 · 02-22-2005, 11:13 PM

I got mine from Radio Shack. The numbers are listed on the bottom of the relay and on the back of the package.

12VDC/30A SPST Automotive Relay
$6.29
Catalog #: 275-226 Model: 275-226

Longhorn Man · 02-27-2005, 10:42 PM

Go to the junk yard, look on the drivers side firewall on a square body fuel injected S-10. Grab the two relays, and cut the harness a good 6 or 8 inches down. Now the splices you'll make will be hidden and protected in the harness, and the connector will be water tight.

*Tanker350* · 07-28-2005, 03:22 PM

If you have a GMC where we have 2 of each head light where Chevy has 1 of each head light, do we need 4 of these relays? Or is it not possible with GMC's?

Blue68 · 07-28-2005, 06:16 PM

Tanker,
The concept is the same. One relay for low beams, one for the high beams. Only your wiring will be slightly different....I'm guessing not knowing the wiring diagram.

**tnblazerk5** · 02-22-2005, 11:23 PM

Quote:

Originally Posted by john_doe

Can the headlight relays be found in the junk yard? And are the numbers 85, 86, 87, 30 found on the relays like in the drawing by crazy4chevs? Thanks.

yes they can you just have to look for them !!! although i didnt use the ones i got from the yard for headlights i used it for elect fans

now i am woundering if i can find the rite kinda thingy for the timed dimer dome lights ?

badpeanut · 02-27-2005, 10:31 PM

For those that have used the Radio Shack style relay, did you mount the relay to the radiator support with a self tapping screw and then use crip on wire connectors to attach to the relay? Anybody have any ideas to make this neater?

02-24-2004, 03:00 PM	#1
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Relay wiring for Headlights??? I can't seem to find the diagram I am looking for for the Headlight relay conversion. I am installing the H-4 conversion from Rick's (great product) and need to know exactly how many and which relays to use. I have a couple of relays that are 4 prong, do I need 2 for each ligh (hi/low)?? Or do I need to get the 5 prong with the 87a terminal and run the 87 terminal to one light and the 87a terminal to the other light and use a 2nd relay for highs? Thanks in advance for the info. I will be posting picks of the original lights and new lights installed with and without relays. Also, does anyone know which relay to use so the interior dome light will fade out slowly (like newer vehicles) when the door is closed? Thanks in advance! Thanks, Shawn __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

02-24-2004, 04:40 PM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	http://www.madelectrical.com/electri...adlights.shtml This site is great@! http://www.madelectrical.com/index.shtml __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

02-24-2004, 05:02 PM	#4
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	You need to use SPST relays either 4 or 5 terminal, 5 terminal just has two 87 terminals. The 87A terminal is on the SPDT relay. Use one relay for low beam one relay for high beam both lights to same relay. Go to this link and click on "Click here to view catalog page"for a terminal diagram. http://order.waytekwire.com/CGI-BIN/...7D7B71+M37+ENG __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

02-24-2004, 06:17 PM	#5
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Thaks guys, that's what I'm looking for. Neonlarry, did you ever figure out the dome light dimmer relay?? Thanks again. Shawn __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

02-24-2004, 07:30 PM	#6
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	No, I haven't figured out the dome light. Give me a couple of year, make and model with them and I'll see what I can find out . I'd like something like that also to go along with the wiper delay switch I'm putting in. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

02-24-2004, 03:56 PM	#2
Alex Hayley Registered User Join Date: Jul 2000 Location: NC Posts: 987	Here is a link that was posted a week or two ago... http://www.classictruckshop.com/club...ead/lights.htm

02-24-2004, 08:05 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	http://www.classictruckshop.com/club...ead/lights.htm Good link, good drawings, good reading.

02-24-2004, 10:44 PM	#8
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	heres annother one. Attached Images __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington .

02-25-2004, 12:53 AM	#9
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Here is a link to a circuit diagram. Most all the parts should be available at radio shack. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

02-26-2004, 12:18 AM	#10
67chevytodd Junior Member Join Date: Aug 2003 Location: SW Nebraska Posts: 50	Relays I was able to find the relays at radio shack for $6 bucks a piece __________________ Old Chevys never die they are just reborn!

02-26-2004, 01:13 PM	#11
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Call 1-866-866-1315 autothisworld I think that have the fading dome light I know they have the one touch up and down for power windows for $39.99. If they dont check some street rod mags. I know I saw it. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

03-07-2004, 03:58 AM	#12
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	I finally got around to doing the headlight conversion on my truck today. I live in a big city with lots of street lights so it's kinda hard to tell the difference but I think there's a little more light now. I haven't had a chance to flip on the high beams and I'm curious how they will look now. Btw, if it's still not enough light after I readjust my lights, I've got a box with the H-4 style lamps with 85/100 watt beams! I wanted to do this on my practice vehicle (my truck) before I do this to my Camaro. Not too difficult, just took about 1/2 a day and some connectors to make everything look stock. __________________ 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...

03-07-2004, 03:01 PM	#13
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	here's another link headlight upgrade __________________ 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...

02-22-2005, 09:19 PM	#14
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Dome light dimmer I got a dome light fader from Web Electric. http://www.webelectricproducts.com/products.htm It works great. Model DLD-1 Dome Light Dimmer Module. I installed it next to the fuse box and hooked into the dome light wiring right there. I also installed two under dash lights to light the footwells and hooked them in. Lights fade out in twenty seconds when the door is closed but go out instantly when the key is turned or the truck is running. I didn't have doorswitches so I installed them in the rubber bumper holes at the top of the doors... much easier to wire and no drilling.. Drilled out the bumper and it fit over the switch too.

02-22-2005, 11:13 PM	#15
Harry's 71 C-10 Registered User Join Date: Dec 2004 Location: Norfolk, VA Posts: 35	I got mine from Radio Shack. The numbers are listed on the bottom of the relay and on the back of the package. 12VDC/30A SPST Automotive Relay $6.29 Catalog #: 275-226 Model: 275-226



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02-27-2005, 10:42 PM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Go to the junk yard, look on the drivers side firewall on a square body fuel injected S-10. Grab the two relays, and cut the harness a good 6 or 8 inches down. Now the splices you'll make will be hidden and protected in the harness, and the connector will be water tight.

07-28-2005, 03:22 PM	#17
Tanker350 Account Suspended Join Date: Dec 2003 Location: Palm Desert, Ca Posts: 410	If you have a GMC where we have 2 of each head light where Chevy has 1 of each head light, do we need 4 of these relays? Or is it not possible with GMC's?

07-28-2005, 06:16 PM	#18
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	Tanker, The concept is the same. One relay for low beams, one for the high beams. Only your wiring will be slightly different....I'm guessing not knowing the wiring diagram. __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.

02-27-2005, 10:31 PM	#20
badpeanut Not a bad nut after all.. Join Date: Dec 2000 Location: ND Posts: 1,759	For those that have used the Radio Shack style relay, did you mount the relay to the radiator support with a self tapping screw and then use crip on wire connectors to attach to the relay? Anybody have any ideas to make this neater? Attached Images

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