Question about 1980 Chevrolet Corvette

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Some times when I turn on my headlights the tail lights don't come on. Sometimes they do Is it the HL switch ?

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  • simone88 Sep 25, 2009

    Yes the only thing that comes on is the Headlights. But the signal and brake lights work ok


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  • Chevrolet Master
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Are all your marker lights out when your tail lights are out?

Posted on Sep 25, 2009

  • Joseph Howard Sep 26, 2009

    I would suspect the headlamp switch is not always connecting the parking light circuit to the 12 volt supply inside the switch .Your brake lights and turn signals don't run thru the headlamp switch that is why they work.I hope this helps


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Why won't my lights work on my 1992 Isuzu Pickup??

its and old car, it a USA car, on this USA forum?
old cars fail and fail with increasing rates.,
pull back on lever, is called FLASH do HIGHS work now???????
why not go to a local autoelectrics, or if in USA< (were are )
go to any ASE shop, they can find this. for sure.
like others, we are forced to guess, (kinda silly that) but we can do the tests you didnt do with your voltmeter,.
so replace the switch, or even find corroded connectors there.
hows this, it might be rusty fuses.... even in groups rusted.
blinks dead.
but are hazards dead???????????????
now head lamps dead.
Park lamps are good but not low beam lamps,(lows and highs)
lets work head lamps, 1 at a time, HL work keys in pocket
and are simple, and makes easy tests.
so what HL do you have, on USA pickup,
the 92 is not like 81.
the 92 uses hot all time head lights
that means the switches ground the head lamps to turn them on.
this is key fact 1. (to test things facts like this are first)

ok , i have your schematic on my screen, (mitchells)
so what color wires do what.?

there is a head light relay.
it has 2 red wires, that go to a 30amp fuse. F2
if the read 0v, at any time that looking ok fuse, is NOT GOOD
looks on fuses only matter if the LOOK blown, and are.
we test them. if savvy.
the relay red/white wires go to 12v, when HL is turned on.
the relay red-blue wire is controlled by the switch
if its 12v HL on the control is failed.
if 0v, HL on, the relay is bad.
lets say the red-blue wire is 12v HL on.
that means the LH switch red-blue wire is 12v HL on
if yes, the then the switch is bad, or the black ground wire to said switch is cut,rusty or bad.
if the wire is 0v, then the the Red-blue wire is cut open.

that is 1/2 the story, so far so good, but there is more.
lets say the red-white was hot, HL on.
at the relay.
that wire goes to fuse 9 and 10.
my guess is both are not bad,. nor both rusty.
but the same ground on the main HL switch
grounds both lamps. HL.
so if the ground seen here fails , the HL have no hope.
fixya photos sux,big time. but here is your HL drawing
my wild and useless guess, (i cant do this for you)
1: the grounds are bad , black, see in red below.
2; or that switch is bad, if 12vdc makes it to the 3 pins
on any headlight, 12vdc in , and 12vdc out says, the switch fails to

note how the flash lever, sends a new ground to the HL.


Dec 01, 2016 | Isuzu Cars & Trucks

1 Answer

I have a 1996 gmc Sonoma. Headlights will work sometimes.

Consider the dimmer switch on the steering wheel; the wires from it wouldn't affect the tail lights, but could possibly affect the headlights. Hopefully loose wires from the assy is the problem.. replacing the unit might be difficult. or expensive.

Jun 01, 2015 | 1996 GMC Sonoma

1 Answer

Headlights, tail lights, interior lights, don't work.

If your 1977 Nova tail lights don't work as soon as you turn on the headlights, your best bet is to return them as they might be defective. There also might be an electrical issue. -------------------------------------------------------------------------------------
Original Launch X431 iCard Scan Tool

Mar 08, 2013 | Mercury Cougar Cars & Trucks

2 Answers

1994 dodge dakota my headlights and tail lights and brake lights don't work my abs and parking brake lights are on my dash lights don't work either I replaced the headlight switch and still no

These are all different circuits. The brake lights are on a 10amp fuse - the headlights are on a 50amp fuse - and the parking and dash lights are on a 20amp fuse.
Do you have power going into the headlight switch and the brake light switch ?

Jan 29, 2013 | Cars & Trucks

1 Answer

1994 Pontiac Grand am Tailights all work normaly except when the headlights are on and then they don't work at all?

Could be the headlight switch.
The switch has two sets of contacts for the parking lights, the park position and headlight position.
You may need to check the circuit at the switch to see if you are loosing power when the switch is moved from park to head.

Dec 23, 2012 | 1994 Pontiac Grand Am

1 Answer

1997 Ford E350 clearance lights don't work

First check the fuse, the clearance lights are not factory in most cases and the wiring gets shorted from poor wiring. Once you replace the fuse see if the lights come on, if the fuse blows right away find the wiring to the clearance lights and disconnect them, if the short goes away it is a I said the wiring is shorted. If you don't have the owner's manual you should be able to download it at the link provided. It should be fuse #10 a 20 AMP in the interior fuse box.

May 05, 2017 | Cars & Trucks

1 Answer

Tail lights don't work on 83 cutlass supreme

I assume you checked the bulbs and they were good? It's possible that the sockets have gone bad and need replacing. The tail lights are fused through the instrument panel lights. that fuse should be in the middle of your fuse box, marked "instr". If the fuse is good check to see if the dash lights come on when you turn the headlight switch on. If they don't then change the headlight switch. hope this helps.

Mar 12, 2012 | 1983 Oldsmobile Cutlass Supreme

2 Answers

Dash lights don't work 1992 jeep wrangler

try turning the headlight knob left to right several times, and jiggle the switch at night. Also check your fuse panel should be a 10 amp or less fuse that says "Insr" or something like it.

Nov 11, 2011 | 1992 Jeep Wrangler

1 Answer

What started this mess? tailights, fog lights, brake lights....

The relay has nothing to do with the tail lights, but replacing the switch sounds like a good idea. There's a nut holding it in place, see to get an idea of the construction. And the price. This is not worth fiddling about unreliable workarounds...
In addition, if fuses 15 and/or 16 burn frequently there might be a problem with the tail light cabling.

Good luck

Feb 28, 2017 | 1987 Volvo 240

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