Click on image for the lowdown. 
====
| | | Forums66 Topics128,147 Posts1,056,801 Members48,454 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | I bought a set of LMC headlight buckets. There are three wires, one yellow, one red and one ground black.
My American auto wire to the headlights show two wires, one Lt. green (high beam) and one tan (low beam).
The question: which wire, red or yellow is the high beam?
~Jim
| | | | | Joined: Feb 2002 Posts: 2,893 Socket Breaker | | Socket Breaker Joined: Feb 2002 Posts: 2,893 | It might help if... we knew what year/make/model of truck...
-W | | | | | Joined: Jun 2003 Posts: 565 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 565 | Doesn't matter. Wire both lights the same way. Hit the floor dimmer. One way high beams, the other dim.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Brilliant. I was going to google for the standard sealed beam diagram. Wish I had thought of that.
| | | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | It does matter if you have a wiring harness with a high beam indicator. . . .
Twist them together and test first before crimping /soldering.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | 1. The wiring kit is a Highway 22 from American Auto wire and works on any model. 51 3600
2. My concern was if my high beam indicator would work.
Wouldn't either way would work but would the high beam indicator show high beam only when the high beam is on?
~Jim
| | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | as the farmer says, all you hafta do is hook a wire from a bulb to power and see which beam lights up  Bill | | | | | Joined: Jun 2003 Posts: 565 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 565 | Oops, sorry, forgot about the high beam indicator.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
| | | | | Joined: Oct 2003 Posts: 445 Shop Shark | | Shop Shark Joined: Oct 2003 Posts: 445 | ever hear of a test lite ???.go from there
dan-pa
| | | | | Joined: Dec 2003 Posts: 2,953 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 2,953 | Does your head hurt now???? | | | | | Joined: Apr 2011 Posts: 224 Shop Shark | | Shop Shark Joined: Apr 2011 Posts: 224 | If it were the origianl 6V wiring system, the 14 ga wire would be the high beam, and the 16 ga wire would be low. The high beams required a heavier wire for the current draw.
Dave Baird 1951 Chevy 3803Foot starters are for Stovebolters and people who need a kick in the ...
| | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | The weird thing here is these lights from LMC have three wires, red,grn,&blk. They all are 18 gauge. The wires that came with the wiring kit 12V are 12/14 gauge.
~Jim
| | | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | My wiring kit had the unwired headlight plugs and the terminal ends. I had to crimp them myself (don't ask how many times it took me to get them right) If the LMC plugs only have 18ga wires, you might think about getting new terminal ends from an electronics store and putting them on the wiring harness ends and removing the 18ga wires. Any of the halogen sealed beams or stronger are likely to draw enough amps to stress the 18ga wires.
Also on mine (EZWiring) the high beam indicator and hi beam wires were well labeled. Only guessing was which terminal on the headlight was the high beam. Again the answer is test, test and test again.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | | | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | So Charlie, it looks like from your schematic the top plug or #2 is the "low" beam?
~Jim
| | |
|
|
