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#1 |
Registered User
Join Date: Aug 2007
Location: Clovis, New Mexico
Posts: 18
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Heavy Duty Headlight Harness?
has anybody bought the heavy duty headlight harness in LMC truck magazine? and how well does it work. and how easy is the installation?
Last edited by ShortyStep71; 09-01-2007 at 03:54 PM. |
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#2 |
Senior Member
![]() Join Date: Oct 2001
Location: Edgerton OH USA
Posts: 631
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Re: Heavy Duty Headlight Harness?
It's on my list for my truck. On a normal harness the full power to your lamps has to pass through your light switch to get to the headlights. This causes heat in the switch and voltage drop by the time it gets to the lights. This is easy to see on that low voltage yard lighting you see so much of these days. The further from the power source on 12v DC circuits the dimmer the light will be. Every plug or switch DC current passes through reduces the voltage as well as there is also a certain drop per foot of wire.
The LMC harness uses a relay to supply power to the lights. Your dash mounted light switch then uses lower apmerage to close the relay when you turn the lights on. Look at the relay as a wall switch. Your dash mounted switch now just takes the place of your finger turning on the lights. Current now goes from the battery to the relay to the lights. End result is the switch runs cooler and the power to the lights has a shorter and more direct path to the lights resulting in a brighter light. This is a big plus if you are running high power lights. I ran landing lights in my '67 Corvette high beams and the load caused the circuit breaker to cut out after about 10 minutes. The relay system would have cured this. I understand it is a plug in installation. I was thinking that I was going to have to make up my own harness for a relay to run my Hella headlights but LMC has done it for me. Tom
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'69 swb stepside in progress. '59 Corvette lifetime project Last edited by basketcase; 09-01-2007 at 04:47 PM. |
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#3 |
Senior Member
Join Date: Aug 2005
Location: OKC, OK
Posts: 2,365
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Re: Heavy Duty Headlight Harness?
They work, but it is Chinese crap and the instructions are hard to read and misspelled. We offer one from AAW, it is twice the price but Aerican Made!
Mike
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Mike Redpath Last edited by Musclerodz; 09-01-2007 at 05:02 PM. |
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#4 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Heavy Duty Headlight Harness?
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#5 |
Senior Member
Join Date: Aug 2005
Location: OKC, OK
Posts: 2,365
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Re: Heavy Duty Headlight Harness?
No, it is 500403 and it is a specific headlight relay kit
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Mike Redpath |
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#6 |
Senior Member
![]() Join Date: Oct 2001
Location: Edgerton OH USA
Posts: 631
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Re: Heavy Duty Headlight Harness?
Thanks for the info. I'd much rather buy American when I can.
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#7 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Heavy Duty Headlight Harness?
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#8 |
Registered User
Join Date: Aug 2007
Location: Clovis, New Mexico
Posts: 18
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Re: Heavy Duty Headlight Harness?
yeah i know, i bought the one in LMC and it looks good but the instructions for installation are junk.
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#9 |
Registered User
Join Date: Apr 2006
Location: va
Posts: 553
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Re: Heavy Duty Headlight Harness?
is it 36-3580 $29.99
Last edited by xshadow; 09-02-2007 at 07:27 PM. |
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#10 |
Registered User
Join Date: Apr 2006
Location: va
Posts: 553
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Re: Heavy Duty Headlight Harness?
Let us know how it works out for you. I'm thinking about buying one or two harnesses.
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#11 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Heavy Duty Headlight Harness?
In the FAQ's section on the board there is a write up on this mod using common auto staore parts.It seems like it was inexpensive and had relays etc. you could replace easily if you ever needed to.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#12 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Heavy Duty Headlight Harness?
I remember seeing that. Good writeup. Just thought if if I could get a a kit with instructions.
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#13 |
Senior Member
Join Date: Aug 2005
Location: OKC, OK
Posts: 2,365
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Re: Heavy Duty Headlight Harness?
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Mike Redpath |
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#14 |
Junior Member
Join Date: Sep 2003
Location: yreka, ca
Posts: 270
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Re: Heavy Duty Headlight Harness?
I followed the write up in the FAQ with Bosch relays I got at the local parts store. Installed on my kid's '67 and it worked great.
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63 C10 70 Coronet R/T 67 C10 70 Dart Swinger 71 K10 |
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#15 |
Registered User
![]() Join Date: Nov 2006
Location: Central Valley, CA
Posts: 198
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Re: Heavy Duty Headlight Harness?
What kit would be recommended as the best/easiest option? Here is another kit that was posted on another thread about this subject: http://www.madelectrical.com/catalog/rly-1.shtml I am assuming you would need to order two of these for it to work. I am just looking for the most straight forward and best quality option there is out there without having to run around looking for pieces to make a kit, plus I am pretty clueless on doing this so the easier the better.
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#16 |
Registered User
![]() Join Date: Nov 2006
Location: Central Valley, CA
Posts: 198
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Re: Heavy Duty Headlight Harness?
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#17 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: Heavy Duty Headlight Harness?
I think I'm going to go with "matt67350" 's writeup in the FAQ. Then follow "TxFirefighter" 's advice and make a trip to the junkyard. At $65 and $10 S&H, I'm going to try and save a little money. Mine's just a driver work truck though.
Thank's "Musclerodz" though for the link and info. Going to be looking into one of your wiring harnesses though. Last edited by airdale94; 09-09-2007 at 11:41 PM. Reason: add |
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