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Headlights Issue - '71 Grandé
#1
Greetings!

When I decided to get a car to work on, I picked up a 1971 Grandé, which was doing fantastic for a while. Unfortunately, out-of-the-blue, my headlights stopped working. Both high and low beams, entirely. My parking lights and tail-lights both work fine however. Now, I'm not the world's greatest electrician, but my google-fu has been found lacking. I have a multimeter, and have been attempting to find out anything that is going on with the headlights, but I'm not entirely sure what to do. I've discovered that flickering headlights are a common issue, but mine merely will not turn on. Does anyone have any suggestions as to what may be wrong? I have not replaced the light switch or the dimmer switch as of yet. I can see the ground for the headlights and it looks fine, but how would I test to see if it is no longer grounded?

Thanks!
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#2
I see this is your first post so welcome to the site. Please post an introduction thread.

The common problem with the headlights on our cars is the headlight switch. Some other members may have some other possibilities also.



Mike AKA Ole Pony & Rare Pony

Our current Mustang garage/driveway
1973 Mustang Convert - Bought in 1974 - Still have it!
2004 Mach 1 Oxford White Auto, Bought Sept 06


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#3
Your dimmer switch may be bad as well. You can remove the connector to the dimmer switch. The middle (red/orange) wire is the power from the headlight switch. That should be 12V when the headlight switch is pulled out. If it is, chances are the dimmer switch is bad. If no voltage, the headlight switch is bad.

Let me check your shorts!
http://midlifeharness.com

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#4
do the running lights come on when you turn the headlights switch on. if you pull it to the first click the running lights come on. second click headlights.

if the running lights come on then the overload fuse in the headlights switch might of blown out from age. you will need a replacement switch.

Do the interior dash lights dim and get bright when you turn the knob, if you lock it to the right does the dome light turn on with the doors closed. again would point to the switch and not a ground problem.
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#5
I have had the high/low beam floor switch being flaky cause that...

1972 H-code Mach1
2010 GT Premium
2015 Hyundai Sonata Sport 2.0T
1995 F150- The "home depot" machine
2012 Harley Davidson Road Glide Ultra
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#6
Thanks midlife! I was able to use this to determine that the issue was the headlight dimmer switch was bad. I disassembled and cleaned the dimmer switch to make sure, and now the lights work! Now to just wait for a replacement switch to come in the mail!

midlife;173174 Wrote:Your dimmer switch may be bad as well. You can remove the connector to the dimmer switch. The middle (red/orange) wire is the power from the headlight switch. That should be 12V when the headlight switch is pulled out. If it is, chances are the dimmer switch is bad. If no voltage, the headlight switch is bad.
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#7
Excellent. Glad to assist.

Let me check your shorts!
http://midlifeharness.com

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[Image: oldfart.png]
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