Question about 1997 GMC Suburban

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Where is the headlight circuit fuse or circuit breaker? The grandkids were playing in the car and drew down the battery. I put a charger on it and hit it with a 50 amp starting charge. After that, the headlights don't work.

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You may have blown the headlight bulbs, the fuse is in the fuse box under the hood or around the dash area......hope this helps.....cheers

Posted on Aug 10, 2010

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As soon as I turn headlights on it blows the fuse for gages on dash no wires touching and lights don't come on gages work if I don't turn headlights on


Hi Bobbi
A 50w Headlamp will draw 4 Amps (Ohms Law 50/12=4.1)
So... 2 Low beams will draw 8 Amps.
Obviously more for high beam and high wattage Quartz Bulbs.
That is a lot for a small switch (contacts) to handle.
This is why a lot of vehicles use a Relay to power the Headlamps.
The relay is connected directly from the Battery to the Headlamps.
The large internal contacts can handle the higher current (30A) and the dash headlight switch connects to the magnetic coil inside the relay and is only used to pull the contacts closed.
Does your circuit include a relay.? Do you hear a relay click?
simple headlight relay wiring

To assist with your troubleshooting, try disconnecting one head lamp bulb to reduce current load. Does the fuse blow?
A temporary12v circuit breaker could be substituted for the fuse until you determine the problem.


If the circuit is using a relay then there will be a fat wire going from the battery to the Relay. The fine wire on the relay input is the trigger. A 12v test lamp is really useful for troubleshooting around the car. Also a cheap multimeter. Clamp style current meter is also handy to see exactly what current is blowing the fuse

Relays

http://www.ebay.com.au/itm/NARVA-CIRCUIT-BREAKER-REPLACES-STANDARD-BLADE-FUSE-BATTERY-15A-AMP-12V-55715-/321234642731?hash=item4acb13a72b
There is a 10A circuit breaker also like above

Automotive Circuit Breakers Wiring Products

Sep 13, 2015 | Cars & Trucks

1 Answer

Battery just changed, but then went dead. Battery Tender blinks red.


Its possible the charger is telling you the battery is too dead for the charger to work. A safety feature to keep from burning up the charger.
I'm not aware of any fuses between the jumping post and the battery. You may have a short in the car that is draining power.

Mar 05, 2014 | Chrysler Sebring Cars & Trucks

1 Answer

+ Headlight wire on 2008 gmc


YOU HAVE TO MAKE NEW CIRCUIT FROM FUSE BOX WITH A NEW SWITCH AND SEPERATE FUSE.AUTOMOBILE ELECTRICAL CIRCUIT LIKE HOME ELECTRICAL CIRCUIT IF YOU ADD A NEW CIRCUIT HAVE TO REWIRE NEW CIRCUIT FROM BREAKER BOX TO THE NEW CIRCUIT YOU ADDING ON.

Oct 21, 2011 | Cars & Trucks

1 Answer

Cant find the fuse box. The headlights have stopped working, but we cant find where the fuse box is located.


Headlights aren't fused, per se...they are protected by a circuit breaker. If I were you, I'd first check the actual headlight switch. They're relatively inexpensive (I recently put one on a '92 Silverado and it was under $15.

Jan 02, 2011 | 1994 Chevrolet C/K 2500

1 Answer

2000 Mercury G/Marq - After approx 45 mins of the car running, the headlights will start to flash. We've replaced the hlight switch and still does it. Any Suggestions ??


Yes, I suggest looking for the Headlight Relay and a Circuit Breaker. You should find the Relay in the Powerbox under the hood and the circuit breaker should be in the fuse panel.

What is happening is the contacts are overheating. Instead of blowing a fuse some models use a Circuit breaker which recycles when it cools down. You can get the same action out of a Relay that is going bad.

If this continues after you replace the parts you should test the voltage going to the headlights and check the bulb sockets for corrosion. The headlights are made so that the low beam and high beam are separate and they are not on at the same time. If both filaments were on at the same time it would overload the relays and the Circuit breaker.

You will see that the bulbs are rated with 2 numbers, like 45/65 for low and high beam. If one side shorts out it will pull an additional 65 watts. Instead of drawing 90 total on low and 130 on high for 2 headlights, it will pull 155 with 1 headlight shorted. Thats 25 watts more than the Relay or Circuit breaker is suppose to handle. After 45 minutes of this, you get the flashing.

Nov 12, 2010 | 2000 Mercury Grand Marquis

1 Answer

I have a 1995 Buick Century that out of the blue last night, the dash lights, headlights, radio, and dome light quit working. Today I checked the fuses, unplugged the battery to reset the ECM, and fished...


There could be a timed circuit breaker:

Circuit Breakers The headlights are protected by a circuit breaker in the headlamp switch. If the circuit breaker trips, the headlights will either flash on and off, or stay off altogether. The circuit breaker rests automatically after the overload is removed. The windshield wipers are also protected by a circuit breaker. If the motor overheats, the circuit breaker will trip, remaining off until the motor cools or the overload is removed. One common cause of overheating is operation of the wipers in heavy snow. The circuit breakers for the power door locks and power windows are located in the fuse box.

Oct 13, 2010 | 1995 Buick Century

1 Answer

The headlights won't stay on after turning headlights out. Repl. headlight switch, didn't fix problem. Is there a module or component along with this switch. If so where?


YOU COULD HAVE A FAULTY DIMMER SWITCH OR CHECK FUSE OR CIRCUIT BREAKER LOOK FOR CORROSION AT THE FUSE OR CIRCUIT BREAKER TERMINAL.COULD HAVE POOR GROUND CONNECTION.

Aug 17, 2010 | 1993 Pontiac Bonneville

1 Answer

Headlights on my 99 for mustang arent working


Headlights are protected by circuit breakers in your fuse box. They are the larger metal ones. They just pull out, the same as a fuse. For what ever reason, your circuit breaker was heating up, and then tripping, and coming back on when it cooled off. It has probably played out completely now, so will have to be replaced. However, you really need to look for a short in your headlight system. It could be a wire grounding out, or even a faulty bulb or the socket that it goes in to. A new circuit breaker will put you back to where you were (providing your bulbs are okay) but it won't fix the real problem.

May 06, 2009 | 1999 Ford Mustang Cobra

2 Answers

Headlight fuse location


Headlights do not have fuses. They have circuit breakers (thermal cutoffs) ususally in the headlight switch. Headlight circuits aren't fused because once the fuse blows, you're out of luck. At least with a self-resetting breaker, when the circuit cools off, you again have light.

May 04, 2009 | Buick Regal Cars & Trucks

1 Answer

97 hyundai accent no headlights or heater fan


Under the dash fuse box ,fuse 15 (TCM ECT) is a combination of cluster, heater and headlights.probably a relay fuse!!!!! fuse 16is a relay fuse.

Mar 16, 2009 | 1997 Hyundai Accent

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