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#1 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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is it possible to get two bad headlamp switches?
i have to be wrong here..
i was trying to get 12 volts from the brown wire going to the taillight circuit on the firewall from the headlight switch, i checked the switch and i could only get 12v from one of the other tangs for the harness so i got another unit.. doing the same thing so now i figure its user error? I ran a headlamp relay system and that is working and it uses a few wires from the old harness, but it seems like i cant get power through the switch on the dash to anything else.. could use a hand here |
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#2 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: is it possible to get two bad headlamp switches?
Quote:
Check this electrical FAQ thread out. http://67-72chevytrucks.com/vboard/s...d.php?t=815300 You may find your answer there. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#3 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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Re: is it possible to get two bad headlamp switches?
i looked through that stuff.. thank you ..
Not too much has changed inside the car as it relates to the headlight switch except the switch itself.. But to ask a more focused question.. If i have the headlamp switch in my hand off the car and use an ohm meter across where the hot red wire and the brown wire plug in without the harness connected, it should have continuity right? |
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#4 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: is it possible to get two bad headlamp switches?
Quote:
Sorry, I can't answer that. I tried to make a test harness to test the headlight switches and I didn't have any luck getting it to work. I think some of that stuff relays through the turn signal switch. Maybe another member will chime in on the question. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#5 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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Re: is it possible to get two bad headlamp switches?
thanks, i appreciate it.. Not sure how else it would work but i like learning new things like this.. I mean, it is a switch, it would make sense that when you activate it it simply connects the two blades, but i have been wrong before.. So before i buy a third switch ......
i did read on here that some of these new switches suck, so if it is bad its the second Delco.. |
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#6 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: is it possible to get two bad headlamp switches?
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Here is a post from vettevet. There is a plug in the firewall just behind the distributor that carries all the rear light wires. The brown wire is the tail light wire. Check it for power when the HL switch is on. If you want to test the tail lights, and the headlight switch, you could pull the headlight harness plug off the switch and jump between the red power wire, and the brown tail light wire. If they don't work then there is a problem with the brown wire to the rear lights. If the lights work, then jump between the orange wire and the brown tail light wire. The orange wire is actually the feed wire for the tail lights. If the tail lights work then the headlight switch is bad.
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#7 | ||
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,699
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Re: is it possible to get two bad headlamp switches?
Quote:
Quote:
Follow the test procedure outlined by vettevet and you'll find the problem with your lights.. Tracing all these wires on a wiring diagram will help clear things up for you.. |
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#8 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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Re: is it possible to get two bad headlamp switches?
i will work on it today,
i will check the fuse on the tail lights.. i replaced it a few days ago, maybe i pinched that wire putting the kick panel cover on.. (wiring diagram says it feeds the dome too) I will turn my focus to the orange wire.. thank you |
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#9 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: is it possible to get two bad headlamp switches?
To answer your first question Yes you can get one or more bad switches. Go to a different store that sells switches from a different company or at least get a switch that is from a different batch. Sometimes parts from the same batch are all bad. ( recall) situation. When returning a bad part I mark the box so I know that they aren't reselling a bad part.
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#10 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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You should be able to take the switch out of the truck and use your voltmeter/ohm meter and check it for continuity between the different connections on the switch.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#11 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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Re: is it possible to get two bad headlamp switches?
i did put the probe on the red, but was not getting continuity, (i think to the brown wire) but as mentioned above i believe some of the lights that i was having trouble with are fed by the orange wire not the red, and the issue was actually the fuse on the orange wire.. which terminals are fed by the red wire? maybe everything else ?
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#12 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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![]() Quote:
Change the red probe to the orange then and check it. Do both to see which ones are feed by each input. ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#13 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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Re: is it possible to get two bad headlamp switches?
i will try it on the one i took out that i thought was bad, now having second thoughts.. I'll bet the orange wire will have continuity with the middle brown..
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#14 |
Junior Member
![]() Join Date: Mar 2015
Location: Dallas TX
Posts: 71
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Re: is it possible to get two bad headlamp switches?
no continuity between red and tail light brown.. But yes on orange to brown.. I think all these switches are ok..
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#15 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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![]() Quote:
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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