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Headlight issue…again

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Old Feb 1, 2022 | 11:36 PM
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Default Headlight issue…again

I got new front park lamp extension (1977E) and installed both so my blinkers will function. They didn’t work.. I grabbed some electric cleaning spray and started unplugging everything and spraying everything, there was no power to the purple and pink/white wire (flasher relay) so after spraying it clean it worked! The problem is after I took out my front lamp harness to spray the pins and clean them up my blinkers, hazards, reverse and park lights all worked but my headlights won’t turn on.. my front marker lights and turn signal lights stay on (not flashing) when I pull my headlight switch back. I can’t find my wire tester so until then I’d like to reach out for some help. I’m sending a bat symbol to the sky.
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Old Feb 2, 2022 | 06:24 AM
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I have a E77 model as well. First click out on headlight switch and front and side marker lights and tail lights light up. second click, (All the way out) Now the headlights come on.
Not even a test light? Wow your really pushing **** uphill.
Are you getting power to the high/low switch? Then follow it from there. Check the headlight fuse? Have you or previous owner installed headlight relays?
If you can't find your test light go buy a cheap one till you can find your good one.
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Old Feb 2, 2022 | 06:28 AM
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Originally Posted by 4-vettes
I have a E77 model as well. First click out on headlight switch and front and side marker lights and tail lights light up. second click, (All the way out) Now the headlights come on.
Not even a test light? Wow your really pushing **** uphill.
Are you getting power to the high/low switch? Then follow it from there. Check the headlight fuse? Have you or previous owner installed headlight relays?
If you can't find your test light go buy a cheap one till you can find your good one.
im gonna go out and get a test light lol I was just on a timer because I work night shift, the fuse is just fine however the fuse blew when I took out my front lamp harness to inspect (I had my car key turned and didn’t know) so I replaced the fuse with a recommended 20 amp.
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Old Feb 2, 2022 | 06:30 AM
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Originally Posted by ChristineTheVette
im gonna go out and get a test light lol I was just on a timer because I work night shift, the fuse is just fine however the fuse blew when I took out my front lamp harness to inspect (I had my car key turned and didn’t know) so I replaced the fuse with a recommended 20 amp.
yes the headlight switch was on second click (they only ever turned on with high beams) but my front marker lights and blinker lights all stay on when I pull the headlight switch all the way back
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Old Feb 2, 2022 | 06:56 AM
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If they only ever came on with the high beams. have you ever checked the high/ low switch? Mounted on the lower part of the column? Then chase the power through the firewall connector? Etc.?
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Old Feb 2, 2022 | 06:57 AM
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Start with, Do you have power to the high low switch? Light blue wire. Do you have power out of dimmer switch? Tan wire low beam, light green high beam. obviously flick the switch back and forth to check.

Last edited by 4-vettes; Feb 2, 2022 at 07:02 AM.
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Old Feb 2, 2022 | 06:58 AM
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Originally Posted by 4-vettes
If they only ever came on with the high beams. have you ever checked the high/ low switch? Mounted on the lower part of the column? Then chase the power through the firewall connector? Etc.?

i never tried to investigate further than pressing the button under my steering column, I had other things to work on and I don’t mind always having high beams but I spoke to another person who said it could just be a bad bul.
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Old Feb 2, 2022 | 06:59 AM
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Originally Posted by 4-vettes
If they only ever came on with the high beams. have you ever checked the high/ low switch? Mounted on the lower part of the column? The chase the power through the firewall connector? Etc.?

Bulb*
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Old Feb 2, 2022 | 07:05 AM
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2 bad bulbs? Maybe
pretty simple circuit
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Old Feb 2, 2022 | 07:08 AM
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High / switch is activated by pulling turn signal lever towards you. Nothing under the dash other than the vacuum override to raise the doors.
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Old Feb 2, 2022 | 07:10 AM
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77 one year only, "Smart Switch". turn signal, wipers and high/low all on one stalk. And no I didn't name it. G.M. did.
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Old Feb 2, 2022 | 07:28 AM
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Originally Posted by 4-vettes
77 one year only, "Smart Switch". turn signal, wipers and high/low all on one stalk. And no I didn't name it. G.M. did.

ah yes a diagram great, I’ll trace everything when I get my tester
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Old Feb 2, 2022 | 07:38 AM
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Bat symbol located...
Didn't you say at one time your "Smart Switch" pivot bracket was broken?
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Old Feb 2, 2022 | 07:44 AM
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So what did you exactly remove from the NEW forward lamp harness you installed last year?
Removed it from the firewall bulkhead connector and WASHED it down with electrical cleaner.....?
You finally got around to replacing both L & R front turn signal harness pigtails...Good on you!

Last edited by bmotojoe; Feb 2, 2022 at 08:28 AM.
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Old Feb 2, 2022 | 08:33 AM
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headlight grounds.
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Old Feb 2, 2022 | 08:36 AM
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Until you can afford a decent fluke 117 or higher meter, a test light with voltmeter is better then a test light alone.
Something like this...
https://www.amazon.com/JASTIND-Backlit-Digital-Extended-Stainless/dp/B07PX16XDX/ref=sr_1_1?keywords=JTCVT-01B&qid=1643807882&sr=8-1 https://www.amazon.com/JASTIND-Backlit-Digital-Extended-Stainless/dp/B07PX16XDX/ref=sr_1_1?keywords=JTCVT-01B&qid=1643807882&sr=8-1
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Old Feb 2, 2022 | 08:39 AM
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Originally Posted by derekderek
headlight grounds.
If he was yanking connectors to WASH/CLEAN it's possible...
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Old Feb 2, 2022 | 05:09 PM
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Originally Posted by bmotojoe
Until you can afford a decent fluke 117 or higher meter, a test light with voltmeter is better then a test light alone.
Something like this...
https://www.amazon.com/JASTIND-Backl...3807882&sr=8-1
wow that’s a cool looking wire tester! Yes you are correct I basically yanked everything and washed it down with electric cleaner.
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Old Feb 2, 2022 | 05:12 PM
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Originally Posted by bmotojoe
Until you can afford a decent fluke 117 or higher meter, a test light with voltmeter is better then a test light alone.
Something like this...
https://www.amazon.com/JASTIND-Backl...3807882&sr=8-1

i shouldn’t have much to worry about in terms of grounds right? It’s 1 black and 2 green grounds in the front. And in the back of the car there is another ground but I have not touched that.
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Old Feb 2, 2022 | 05:13 PM
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Originally Posted by bmotojoe
If he was yanking connectors to WASH/CLEAN it's possible...
since I immediately got my blinkers to work and my headlights immediately stopped working it’s been frustrating to say the least
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