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You lot're non crazy — those lights did work last twelvemonth. Christmas lights often fire out the moment you unplug them, so the problem often goes unnoticed. At that place are several means to repair your lights, depending on the problem and how hands-on you're willing to get. Start by checking for a blown fuse, a common problem with a quick and piece of cake set.

1
Endeavour this if the entire cord goes out. A blown fuse will plough the entire string dark, not only part of it. This ofttimes happens when also many strings are connected stop-to-end. A fuse can also blow when the wires are accidentally stapled during installation, or when the lights are plugged into a socket with too loftier a voltage (such equally United states of america lights in a UK socket).
- If only some of the lights are nighttime, skip downwardly to replacing the bulbs instead.
2
Open the fuse example. A cord of Christmas lights typically has one or two tiny fuses in the plastic box attached to the prongs. Examine the plastic closely on the side of this box and in betwixt the prongs for a cover you tin can slide or pry open. These frequently get stuck, so y'all may need to apply some force.^[1]
- Do not plug the lights dorsum in at whatever point during this method.
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Check the fuses. Each fuse should be transparent, with an unbroken wire running through each one. If a fuse is black, or if the wire inside is broken, it needs to be replaced.
- You may demand to remove the fuse and hold it up to a bright light to inspect it.
4

Pry out the blown fuses. Gently lever the diddled fuses out with a thin screwdriver.
5
Find an exact replacement. Many Christmas lights are sold with spare fuses for this purpose. If your spares have escaped from the vacation box, have the blown fuses to an electronics store and enquire for a replacement. 100-low-cal strings typically employ 3A fuses, simply it's best to confirm your fuses' rating with a store employee.^[2]
- Never use a fuse with a higher rating. This can crusade a major burn take chances.
- Some LED lights only crave one fuse, but go along a 2d 1 in the plastic compartment as a spare.^[3] If there's a fuse that's non attached to whatever wires, just transfer it over to the other slot.
6
Put in the new fuses. Pop the new fuses into the slots and close the plastic comprehend. Plug the light bulbs in to meet if this has fixed the problem.
- If the lights still won't come up on, attempt a unlike outlet in example you blew a house fuse or circuit. If that doesn't work, keep reading for other solutions.
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1
Purchase a christmas calorie-free repair tool. Nigh of these tools include everything you demand to notice and supplant the bad seedling: a continuity detector, piezoelectric sparker (shunt repairer), and light bulb removal tool. It costs roughly $20 US, so this may non be worth it if you only accept a couple strings of lights. If you adopt to avoid buying such a specialized device, endeavor the following alternatives:
- Get a non contact voltage detector and skip down to tracing the dead bulb. Alternatively, buy a cheaper light seedling tester without the other features.
- Tackle the project hands-on with a homemade tool.
2
Use the spark function on your repair tool. Christmas lights are connected in series, pregnant the whole string volition become night when i bulb fails. A failsafe called a shunt in each seedling is supposed to prevent this past closing the gap beyond the burnt-out bulb, just these oftentimes don't work properly. (In regions on 230V mains rather than 110V, the shunt usually does its job.) The sparker function on your repair tool will zap the shunt, hopefully succeeding in endmost the gap:
- Plug the string of lights into the socket on the repair tool.
- Printing the button (or pull the trigger, depending on the model) about 20 times.^[4] You should hear a click each time.
- Plug the string of lights into a normal outlet. If the string is nevertheless dark, proceed to the next stride. If the cord lights upward except for i or two bulbs, skip downward to replacing individual bulbs.
iii
Trace the location of the dead bulb. If the string of lights yet won't light upwards, move on to the detector. This detects the current running through the wires, so yous can place the point where it fails.^[5] Hither's how:
- Tug apart the braided wires to identify the one directly connected to the light bulbs.
- Place the detector on this wire about halfway along the cord, betwixt two bulbs. (If your tool has a pocket-size hole for a detector, identify a low-cal seedling into the hole instead.^[6])
- If the tool hums or lights upward (depending on model), the problem is in the half of the string uttermost from the plug. If there is no hum or light, the trouble is in the one-half closest to the plug.
- Move the tool to the center of the problem surface area and test again, narrowing it down to ¼ of the string.
- Repeat until you find a bulb with current on one side of it and no electric current on the other. Mark this seedling with tape so you don't lose track, then supercede this bulb as described below.
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1

Understand the goal. Each Christmas lite seedling has a "shunt" that is supposed to close the gap when the seedling burns out. This frequently fails, but a minor surge of electric current can trigger this and put your lights back on.^[7] This will not piece of work every fourth dimension, specially with this DIY arroyo. If you're looking for quick results, try the methods to a higher place instead.
ii

Find a lighter operated by button. This type of lighter has a piezoelectric crystal which creates a spark when pressed. Do not utilise the type with a metal wheel, which creates the spark through friction.
3
Empty the lighter of fuel. If the lighter is disposable, merely burn the fuel away. If the lighter is refillable, transfer the lighter fluid to another lighter, or to a sealed, clearly labeled fire-proof container.
- Never dispose of lighter fluid in a drain or in household trash.
4
Remove the piezo igniter. Pry apart the plastic cover, then lift out the igniter with a pair of needle olfactory organ pliers.^[8] The piezo igniter includes a button, and two tiny metal or plastic prongs. When the button is pressed, a spark jumps between these prongs.
- The spark is not dangerous, but information technology will give you a balmy electrical shock. More importantly, it could ignite fumes and calorie-free a small flame. Work over a nonflammable surface and keep your fingers and face away from the sparker during removal.
five
Zap the prongs of the calorie-free string. Position the two prongs of the sparker confronting the two prongs of the Christmas light plug. Button the push button almost 10–20 times. You lot should hear a click and encounter a spark each time.
- If information technology'due south likewise difficult to line upward the prongs, connect them with insulated wires.
vi

Plug in your lights. If all went well, the lights should now light up. There will be one or two dead bulbs, which should be replaced as described below. Leaving the expressionless bulbs on will cause the other bulbs to burn out sooner.

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1
Twist the low-cal bulb to check the connection. This is rarely the problem, but it only takes a 2d to check. Twist the light seedling gently to tighten it in position. If the bulb moved noticeably, plug in the lights and see if a loose connection was causing the issue. Assuming the bulb is still out, continue to the side by side stride.
- If you have many lights, buy a string of bulbs of the same make and blazon. Keep it in storage and twist off the bulbs to use equally replacements when you need them.
2
Purchase replacement bulbs. If y'all don't have any replacements, accept along the burnt-out bulbs to a hardware shop, pharmacy, or home improvement store. Wait for bulbs that friction match every bit closely every bit possible. Ideally, check the packaging your lights came in to see what type of seedling is needed.
- Some bulbs are flashers, and when installed, volition cause lights to flash on and off. In that location is no need to have two flashers on the same excursion, equally they may cause unusual on / off timings.
iii
Remove each of the blown-out Christmas light bulbs. Utilize your pollex and alphabetize finger to delicately put pressure on each of the broken light'due south plastic base, to remove the delicate bulbs. If you accept a Christmas light repair tool, it may come with a pocket-sized grip for this purpose.
- In society to remove a broken Christmas bulb from its socket, find the two copper wires that sit on the base of operations of the old seedling, noting their position on the base.
- Push both of the copper wires downward, so that they are pointing towards your floor, and the seedling is pointing towards the ceiling.
- Pull upward on the seedling, and it should at present be separated from the calorie-free's base.
iv
Insert the replacement seedling into the old seedling's socket. Brand certain the two copper wires are completely aligned with the holes in the bulb's base of operations. Once the seedling is fully seated in the base of operations, fold the copper wires confronting the base in the aforementioned position every bit noted above. Plug in your lights and picket them glow.
- If you used a continuity/voltage detector tool, and your lights still won't turn on, use the tool once more. There may be a second burned-out bulb. These tools can only detect 1 burned out seedling at a time.
5
Remove cleaved sockets. If a new seedling still won't light upwardly, your socket may be corroded or the wire may be damaged nearby. Removing this is not as difficult equally it sounds, although each bulb you remove will cause the remaining bulbs to burn down more brightly and therefore burn out sooner though removing 1 or two bulbs should be fine. (Note that a damaged wire or a repair using this method, unless done well, may nowadays an electric daze or burn down gamble. If you don't feel comfortable removing light bulb sockets, then you tin can just leave a light bulb in the socket or cover it with electric tape to prevent an electric daze.) Follow this method:
- Unplug the lights.
- Using wire cutters, cutting the wire on either side of the broken socket. (Do not cut the other ii wires.)
- With a wire stripper, strip about ½ inch (one.25cm) of insulation from each cut end.
- Twist the ii strands of wire together.
- Go a twist connector from an electronics store (a pocket-size conical cap). Twist this over the wire, holding it in place.
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Add New Question

Question

What do I practise if it appears my whole set up has blown, but the fuses are notwithstanding good?

Bank check the entire wire, start at the plug, for a shunt interruption using the red gun. Read the instructions carefully; they seem very complicated at get-go, just get intuitively clear every bit you become more than familiar with it. At the starting time interruption, replace the light seedling. Go on to practice that all along the manner. Somewhen, 1 replaced seedling may light up the whole set.
Question

What do I exercise if I cannot remove the dead bulb from the original socket to supervene upon or test it?

Use a sparse knife bract to remove the bulb holder from the socket. And then you can remove the bulb from the holder.
Question

Why does the whole gear up of lights burn out when but one light burns out?

The lights are connected in a series circuit, and then if ane light burns out the, metal inside isn't conductive anymore. This ways that the energy can't become past that piece of metallic, which results in everything burning out.
Question

Why are office of my strands out if my lights were new?

Some of the bulbs may not be in all the fashion or they may accept been lacking at the fourth dimension of manufacture or sale. Commencement, make sure they are fully inserted into the sockets so yous can exist certain whether or not that is the issue. If this doesn't help, return the lights to the store for an exchange or refund.
Question

Why are some of my Christmas lights not as bright as others?

John Croft

Community Respond

They may be shut to going out and need the bulbs to be replaced. If they are new, so they are not as bright as advertised.
Question

What practise I exercise if my light strand is out?

Try replacing the strand. If that does not help, then it's possible that the lights need to be tending of appropriately.

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Replace all burnt out lamps in the comfort of your living room before hanging exterior.
Every year when taking out your lights for reuse, ever audit light strings for damage before connecting to power. Practice this under proficient light conditions so that you can hands see frayed cords, burnt out bulbs, bad connections, etc. Be alarm for any chewing of cords that may have taken place during storage.
Before discarding a damaged string, remove working bulbs to use as spares.
Replacement Christmas lights are much cheaper correct later the wintertime holidays.

Thank you for submitting a tip for review!

Use calorie-free strings outdoors merely if they are labeled for Outdoor or Indoor/Outdoor use.
If a cord has damaged insulation with visible copper wire, do not apply the lights.
Electric outlets on the exterior of homes should have weatherproof chimera-like covers that forbid water from entering even while a cord is continued.
The National Electrical Code (USA) prohibits any holiday lighting to remain in place for more than 90 sequent days. Land and local codes however, may alter the length of fourth dimension allowed.
Utilize not-conductive supports designed for light strings to preclude accidental energizing of metal gutters, downspouts, railings, trim, etc.
Hang sections of lights while they are disconnected from a ability source, and briefly check periodically every bit you become to prevent accidental daze.

Things You'll Need

Screwdriver
Replacement fuses

Christmas tree repair tool or non-contact voltage detector

Button-operated lighter

Replacement bulbs
Rarely:
- Wire cutters
- Wire strippers
- Twist connectors

Nearly This Article

Article Summary Ten

To ready Christmas lights if the unabridged string goes out, beginning past unplugging the string and opening the fuse case, which is the plastic box attached to the electrical prongs. If a fuse is black or has a broken wire inside, gently pry out the blown fuse with a thin screwdriver. Then, if you don't have a spare fuse, take the blown fuse to an electronics store to become an exact replacement, because putting in the wrong fuse can cause a burn hazard. Once y'all have the right fuse, pop it into the empty slot and close the plastic cover. For more tips, like how to detect a dead bulb on your Christmas lights, read on!

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