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#1 |
Registered User
Join Date: May 2015
Location: london ontario
Posts: 6
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Headlights still wont work
Hey guys, I made a thread a few weeks ago regarding my headlights not working. everyone suggested it was the dimmer switch and the wiring involved. I have now replaced the dimmer switch and the little 3-prong plug that it attaches to on the wires. I cut the wires and stripped about a half inch of insulation on the new plug and old wires to twist them together. I was planning on soldering the wires (I have never done soldering but I am a very confident learner and believe I have a pretty good idea of what to do) but my soldering iron is a small battery powered piece of junk that only has about 3 volts of juice. it wasn't even hot enough to melt the solder to prep the iron. I have all of the wires connected (tied) and wrapped with electrical tape, brand new dimmer switch and plug, and the headlights still will not turn on. I drew a diagram of the wires looking down on the dimer switch it reads GREEN BLUE BROWN in that exact order. any ideas as to where I should troubleshoot next? Does my diagram line up with what you guys have or could I have just made a simple error in my wiring...? thanks everyone for the responses I really appreciate the advice
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#2 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: Headlights still wont work
I just went through similar and it ended up being the headlight switch in the dash.
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#3 |
Registered User
Join Date: May 2015
Location: london ontario
Posts: 6
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easy part to find?
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#4 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: Headlights still wont work
You can probably still get one at the parts store. I had an extra here that i used.
You are sure the bulbs are good?
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#5 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,638
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Re: Headlights still wont work
Yes, the headlight switch should be easy to find. And be sure to beg, borrow, or buy a decent soldering iron, some rosin-core solder, and heat shrink tubing. Twist & tape won't be a good connection and won't last very long. Might also have to break out a VOM or at least a test light and start chasing voltage (or lack of it).
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#6 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: Headlights still wont work
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#7 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: Headlights still wont work
Lucky you, VetteVet just showed up. Here's some more help curtesy of VetteVet. Bet he doesent even remember posting this but it helped me out in my time of need!
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#8 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Headlights still wont work
The blue wire to the dimmer switch is the power wire when the headlight switch is pulled out. If you have power on the blue wire when the switch is out and none when the switch is in, then the switch is OK and is doing what it's supposed to do.
The dimmer switch merely selects power from the blue wire to the brown or green wire depending on whether high or low beams are desired. If you get no power from the blue wire to either the green or brown wire or both, then the dimmer switch is defective. The dimmer switch is not grounded so that is not a factor. You can jump a wire between the blue wire and the green or the brown wire to bypass the dimmer switch. If you get lights, then the dimmer switch is bad. If you don't then you may have a bad connection inside the firewall block that connects the green and brown wires with the green and brown wires on the engine side of the firewall block. You can pull the plug on the left headlight and check for power on the green and brown wires in that plug to see if power is getting to the headlight. The left headlight plug has 2 each brown and green wires to feed both lights with high and low beam power. If you get power there, then the firewall block connections are good and the problem is in the head light.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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