Lost headlights on 91 Camaro WTF?
#1
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Car: 91 CAMARO RS,31 FORD MODEL A,71 CHEVELLE SS 454
Engine: TBI 305
Transmission: 700 r- 4
Lost headlights on 91 Camaro WTF?
Just lost all 4 headlights on 91 RS. Tail lights and dash lights still working.
Thinking switch or relay, yes/no?
Where's the relay located?
Thinking switch or relay, yes/no?
Where's the relay located?
#2
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Lost headlights on 91 Camaro WTF?
Your car has no relay and no fuse for the head lamps. The parking lamp/ head lamp pull switch and the low beam/ high beam (DIMMER) switch on the steering column are responsible for allowing 12V to the head lamps.
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Re: Lost headlights on 91 Camaro WTF?
Check "fusable link A" , which is said by the schematic to be "rust" colored . This fusable link feeds the headlight portion only of the headlight switch , and if bad would put your headlights out while still allowing your instruments and tail lights to function since their portion of the headlight switch gets power from a different source (the 20A fuse marked "tail" in the fusebox) . The solid red wire to the headlight switch is fed from this fusable link , so a 12V automotive test light will tell you if the red wire has power . If yes , turn the switch on and check the yellow wire , this leads from the switch and goes to the High beam/low beam switch . If the yellow does have power , then next check the tan (low beam) and the light green (high beam) from the dimmer switch for power in either position . If , in the odd case you DO have power on either the high and low beam wires , next up could be any connector between the high beam switch and the wiring itself , or maybe you lost the ground side to all 4 lights all at once , or , (crazy unlikely) maybe a monster voltage spike took em all out ? Also , just as an FYI , there is a circuit breaker built into the headlight switch itself and is part of the switch and not separately replaceable . This is a self resetting breaker and if your lights are drawing too much power it will turn the lights off and on , the speed of the blinking depending on the severity of the overload . Drawing quite a bit over ? they will blink fast . Only somewhat overloaded ? they will blink slower .
The above wiring info taken from austinthirdgen 1991 body wiring diagrams .
The above wiring info taken from austinthirdgen 1991 body wiring diagrams .
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vorteciroc (07-10-2021)
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Car: 91 CAMARO RS,31 FORD MODEL A,71 CHEVELLE SS 454
Engine: TBI 305
Transmission: 700 r- 4
Re: Lost headlights on 91 Camaro WTF?
Thanks guys that should help chase it down.
#5
Re: Lost headlights on 91 Camaro WTF?
Check "fusable link A" , which is said by the schematic to be "rust" colored . This fusable link feeds the headlight portion only of the headlight switch , and if bad would put your headlights out while still allowing your instruments and tail lights to function since their portion of the headlight switch gets power from a different source (the 20A fuse marked "tail" in the fusebox) . The solid red wire to the headlight switch is fed from this fusable link , so a 12V automotive test light will tell you if the red wire has power . If yes , turn the switch on and check the yellow wire , this leads from the switch and goes to the High beam/low beam switch . If the yellow does have power , then next check the tan (low beam) and the light green (high beam) from the dimmer switch for power in either position . If , in the odd case you DO have power on either the high and low beam wires , next up could be any connector between the high beam switch and the wiring itself , or maybe you lost the ground side to all 4 lights all at once , or , (crazy unlikely) maybe a monster voltage spike took em all out ? Also , just as an FYI , there is a circuit breaker built into the headlight switch itself and is part of the switch and not separately replaceable . This is a self resetting breaker and if your lights are drawing too much power it will turn the lights off and on , the speed of the blinking depending on the severity of the overload . Drawing quite a bit over ? they will blink fast . Only somewhat overloaded ? they will blink slower .
The above wiring info taken from austinthirdgen 1991 body wiring diagrams .
The above wiring info taken from austinthirdgen 1991 body wiring diagrams .
#6
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Lost headlights on 91 Camaro WTF?
If an unprotected direct power-source is connected to the the Headlamp-Switch...
and the the Headlamps still do not operate; it is possible that the Headlamp-Switch itself is inoperable.
If disassembled; the Headlamp-Switch contains its own built-in Circuit-Breaker... it can fail in the OPEN position.
Also the "Dimmer-Switch" (the actual device that switches between Low-Beam and High-Beam Lights; not the Multi-Function Lever) can also be inoperable.
A Digital Multi-Meter is an invaluable tool in this situation, to test for continuity through these Switches/ Components.
I would however still test all the Head-Lamp circuits continuity as well.
and the the Headlamps still do not operate; it is possible that the Headlamp-Switch itself is inoperable.
If disassembled; the Headlamp-Switch contains its own built-in Circuit-Breaker... it can fail in the OPEN position.
Also the "Dimmer-Switch" (the actual device that switches between Low-Beam and High-Beam Lights; not the Multi-Function Lever) can also be inoperable.
A Digital Multi-Meter is an invaluable tool in this situation, to test for continuity through these Switches/ Components.
I would however still test all the Head-Lamp circuits continuity as well.
Last edited by vorteciroc; 07-10-2021 at 07:05 PM.
#7
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Lost headlights on 91 Camaro WTF?
Check "fusable link A" , which is said by the schematic to be "rust" colored . This fusable link feeds the headlight portion only of the headlight switch , and if bad would put your headlights out while still allowing your instruments and tail lights to function since their portion of the headlight switch gets power from a different source (the 20A fuse marked "tail" in the fusebox) . The solid red wire to the headlight switch is fed from this fusable link , so a 12V automotive test light will tell you if the red wire has power . If yes , turn the switch on and check the yellow wire , this leads from the switch and goes to the High beam/low beam switch . If the yellow does have power , then next check the tan (low beam) and the light green (high beam) from the dimmer switch for power in either position . If , in the odd case you DO have power on either the high and low beam wires , next up could be any connector between the high beam switch and the wiring itself , or maybe you lost the ground side to all 4 lights all at once , or , (crazy unlikely) maybe a monster voltage spike took em all out ? Also , just as an FYI , there is a circuit breaker built into the headlight switch itself and is part of the switch and not separately replaceable . This is a self resetting breaker and if your lights are drawing too much power it will turn the lights off and on , the speed of the blinking depending on the severity of the overload . Drawing quite a bit over ? they will blink fast . Only somewhat overloaded ? they will blink slower .
The above wiring info taken from austinthirdgen 1991 body wiring diagrams .
The above wiring info taken from austinthirdgen 1991 body wiring diagrams .
I slept on this one...
I appreciate you stepping in as you always contribute solid information!
Last edited by vorteciroc; 07-10-2021 at 08:51 PM.
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