LED Headlight Issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VETTE10R · 10-14-2019, 01:58 PM

I installed a set of Morimoto Sealed7 1.0 LEDs on my 66 C10. Both lights have the standard H4 plug and a 4th wire with a female terminal which is for DRL's. I'm not to concerned with the DRL's right now but the issue is when I turn the high beams on.

Low beam everything works fine, when I hit the high beam the drivers side switches to high as it should but the passenger light turns completely off. Has anyone ran into an issue like this? Is it possible that some wiring is backwards even though its plugged directly into the H4 plug?

**Ol Blue K20** · 10-14-2019, 02:21 PM

How did it work with standard bulbs? I'm leaning towards something wrong with new LED Bulb. Check the voltage with a meter to confirm it's getting power

95 S_Trucker · 10-14-2019, 02:51 PM

Swap the bulbs from side to side and see what happens. If it follows the bulb, you have a bad one.

weq92f · 10-14-2019, 02:54 PM

.
Sounds like faulty new equipment to me. Can you swap the high beam "bulb" from the one that works to the one that doesn't? If so that would tell ya something.

If not then you'd be swapping the entire housing from side to side for the same test...probably not what you want to do.

I think even LED requires some sort of ballast so maybe you could just swap that component from one side to the other? Maybe that component is built into the housing though...

I think you're new LED High beam on one side is DOA.

-klb

Southcity · 10-14-2019, 03:00 PM

The suggestions provided to date are spot on. When installing it's best to plug everything in and test before final assembly, this way you can be sure both sealed headlights are working as they should and you have no wiring issues. If one is bad it's easy to send it back without having to disassemble. Please post info about which model you purchased if you can. Good luck!

VETTE10R · 10-14-2019, 03:24 PM

I'll have to swap the entire housing at they are sealed 7" round headlights. I'll try swapping them when I get home tonight and see if the issue follows the light.

VETTE10R · 10-14-2019, 03:25 PM

This is the best picture I have right now of what they look like...

Southcity · 10-14-2019, 05:01 PM

Thanks for sharing the pic. Curious if you have done any kind of wiring upgrade to your truck (i.e Headlight Relay kit)? Here is a link to a review I did for the 5 3/4 size LED lights for a 66 GMC: http://67-72chevytrucks.com/vboard/s...d.php?t=755421

VETTE10R · 10-14-2019, 05:07 PM

Quote:

Originally Posted by Southcity

Thanks for sharing the pic. Curious if you have done any kind of wiring upgrade to your truck (i.e Headlight Relay kit)? Here is a link to a review I did for the 5 3/4 size LED lights for a 66 GMC: http://67-72chevytrucks.com/vboard/s...d.php?t=755421

No relay kit just straight plugged into the H4 plug. Do you have a link to the relay harness you used?

Southcity · 10-14-2019, 05:15 PM

I built my relay kit myself, it was a project and required investment in some quality electrical parts but it was worth it to me. There are many threads on this board that explain how to make your own or LMC sells a pretty good kit too, I have seen many on this board say good things about it.

VETTE10R · 10-14-2019, 05:27 PM

Thanks

Southcity · 10-14-2019, 05:34 PM

Keep us updated on your lighting project, your trucks looks great!

VETTE10R · 10-14-2019, 06:18 PM

It looks like LMC does not have a harness listed for a 66. I should be good with the harness for 67-72 right? Or is that harness missing something I would need?

http://www.lmctruck.com/Features/CB/CBCO7.htm

VETTE10R · 10-14-2019, 07:19 PM

Well the issue is not following that light. I'm assuming I need a relay harness to send the power to both lights.

**Ol Blue K20** · 10-14-2019, 07:45 PM

Trace the high beam wire back and see where it's losing power. It should have power even without a relay kit. You probably have a bad connection or broken wire.

VETTE10R · 10-14-2019, 08:28 PM

Quote:

Originally Posted by Ol Blue K20

Trace the high beam wire back and see where it's losing power. It should have power even without a relay kit. You probably have a bad connection or broken wire.

Spot on, that's exactly what i did and i found a broken wire everything is working now!! I do want to get all new H4 connectors and wire and rewire is all so that's on the list now.

It would be nice to find a way to adjust the lights up a little more, with the truck sitting so low and it have a rake to the stance that dont shine as fast they could. Much brighter than stock though that's for sure!!

VETTE10R · 10-14-2019, 08:29 PM

...

VETTE10R · 10-14-2019, 08:30 PM

Sorry I still cant figure out how to get pictures to upload correctly, they seem to randomly set themselves lol

weq92f · 10-14-2019, 08:33 PM

.
Glad you got it sorted! I was gonna ask for a picture like this glad you posted one up...

Flip fa ya...

VETTE10R · 10-14-2019, 08:36 PM

Quote:

Originally Posted by weq92f

.
Glad you got it sorted! I was gonna ask for a picture like this glad you posted one up...

Flip fa ya...

Thanks for the help. That's just low beam there, I'll grab some high beam and post them up too. I'd say if anyone is looking at this upgrade this set is on close out for $150 a pair compared to $600 a pair for the new model. Check them out!

VETTE10R · 10-14-2019, 08:44 PM

Here is a low/bright comparison, the truck is in my garage just shining out into the yard...

VETTE10R · 10-14-2019, 08:45 PM

Sorry about the upside down again haha

**Ol Blue K20** · 10-14-2019, 09:23 PM

Nice, I'm glad you got it figured out.

VETTE10R · 10-14-2019, 10:04 PM

Sorry about the picture overload but I figure others might search someday and want to see... hopefully they aren't all upside down! Haha

VETTE10R · 10-14-2019, 10:06 PM

^^^ first pic is low beam and second is high beam. If I can get them aimed up a little more the low beam will be alot better but either way I'm very happy with these so far...

10-14-2019, 01:58 PM	#1
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	LED Headlight Issue I installed a set of Morimoto Sealed7 1.0 LEDs on my 66 C10. Both lights have the standard H4 plug and a 4th wire with a female terminal which is for DRL's. I'm not to concerned with the DRL's right now but the issue is when I turn the high beams on. Low beam everything works fine, when I hit the high beam the drivers side switches to high as it should but the passenger light turns completely off. Has anyone ran into an issue like this? Is it possible that some wiring is backwards even though its plugged directly into the H4 plug?

10-14-2019, 02:21 PM	#2
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 15,834	Re: LED Headlight Issue How did it work with standard bulbs? I'm leaning towards something wrong with new LED Bulb. Check the voltage with a meter to confirm it's getting power __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

10-14-2019, 02:51 PM	#3
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,178	Re: LED Headlight Issue Swap the bulbs from side to side and see what happens. If it follows the bulb, you have a bad one.

10-14-2019, 02:54 PM	#4
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 2,877	Re: LED Headlight Issue . Sounds like faulty new equipment to me. Can you swap the high beam "bulb" from the one that works to the one that doesn't? If so that would tell ya something. If not then you'd be swapping the entire housing from side to side for the same test...probably not what you want to do. I think even LED requires some sort of ballast so maybe you could just swap that component from one side to the other? Maybe that component is built into the housing though... I think you're new LED High beam on one side is DOA. -klb __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

10-14-2019, 03:00 PM	#5
Southcity Registered User Join Date: Aug 2007 Location: Redwood City, CA Posts: 1,174	Re: LED Headlight Issue The suggestions provided to date are spot on. When installing it's best to plug everything in and test before final assembly, this way you can be sure both sealed headlights are working as they should and you have no wiring issues. If one is bad it's easy to send it back without having to disassemble. Please post info about which model you purchased if you can. Good luck! __________________ 66 GMC Suburban Custom 66 Chevy K10 Suburban

10-14-2019, 03:24 PM	#6
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue I'll have to swap the entire housing at they are sealed 7" round headlights. I'll try swapping them when I get home tonight and see if the issue follows the light.

10-14-2019, 03:25 PM	#7
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue This is the best picture I have right now of what they look like... Attached Images

10-14-2019, 05:01 PM	#8
Southcity Registered User Join Date: Aug 2007 Location: Redwood City, CA Posts: 1,174	Re: LED Headlight Issue Thanks for sharing the pic. Curious if you have done any kind of wiring upgrade to your truck (i.e Headlight Relay kit)? Here is a link to a review I did for the 5 3/4 size LED lights for a 66 GMC: http://67-72chevytrucks.com/vboard/s...d.php?t=755421 __________________ 66 GMC Suburban Custom 66 Chevy K10 Suburban

10-14-2019, 05:15 PM	#10
Southcity Registered User Join Date: Aug 2007 Location: Redwood City, CA Posts: 1,174	Re: LED Headlight Issue I built my relay kit myself, it was a project and required investment in some quality electrical parts but it was worth it to me. There are many threads on this board that explain how to make your own or LMC sells a pretty good kit too, I have seen many on this board say good things about it. __________________ 66 GMC Suburban Custom 66 Chevy K10 Suburban

10-14-2019, 05:27 PM	#11
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue Thanks

10-14-2019, 05:34 PM	#12
Southcity Registered User Join Date: Aug 2007 Location: Redwood City, CA Posts: 1,174	Re: LED Headlight Issue Keep us updated on your lighting project, your trucks looks great! __________________ 66 GMC Suburban Custom 66 Chevy K10 Suburban

10-14-2019, 06:18 PM	#13
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue It looks like LMC does not have a harness listed for a 66. I should be good with the harness for 67-72 right? Or is that harness missing something I would need? http://www.lmctruck.com/Features/CB/CBCO7.htm

10-14-2019, 07:19 PM	#14
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue Well the issue is not following that light. I'm assuming I need a relay harness to send the power to both lights.

10-14-2019, 07:45 PM	#15
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 15,834	Re: LED Headlight Issue Trace the high beam wire back and see where it's losing power. It should have power even without a relay kit. You probably have a bad connection or broken wire. __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

10-14-2019, 08:29 PM	#17
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue ... Attached Images



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10-14-2019, 08:30 PM	#18
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue Sorry I still cant figure out how to get pictures to upload correctly, they seem to randomly set themselves lol

10-14-2019, 08:33 PM	#19
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 2,877	Re: LED Headlight Issue . Glad you got it sorted! I was gonna ask for a picture like this glad you posted one up... Flip fa ya... Attached Images __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

10-14-2019, 08:44 PM	#21
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue Here is a low/bright comparison, the truck is in my garage just shining out into the yard... Attached Images

10-14-2019, 08:45 PM	#22
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue Sorry about the upside down again haha

10-14-2019, 09:23 PM	#23
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 15,834	Re: LED Headlight Issue Nice, I'm glad you got it figured out. __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

10-14-2019, 10:04 PM	#24
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue Sorry about the picture overload but I figure others might search someday and want to see... hopefully they aren't all upside down! Haha Attached Images

10-14-2019, 10:06 PM	#25
VETTE10R Registered User Join Date: Sep 2019 Location: Wyoming MN Posts: 47	Re: LED Headlight Issue ^^^ first pic is low beam and second is high beam. If I can get them aimed up a little more the low beam will be alot better but either way I'm very happy with these so far...

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