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Fuse Keeps Blowing

A fuse that blows again after being replaced means the circuit is drawing too much current, most often from a short to earth in chafed wiring, a seized motor or a faulty component; it is a warning, not a fuse problem.

High risk

Get it checked soon. Never fit a higher-rated fuse; the wiring can overheat and cause a fire.

Short answer · Why does the same fuse keep blowing?

A fuse protects the wiring by breaking when current is too high. If it blows again, something on that circuit is wrong. Wiring that rubs through its insulation, often in door hinges or near the boot, can short to the body. A seized motor such as a wiper or blower motor draws high current. Water inside a lamp or plug can also cause a short.

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Safe checks you can do

  1. Identify the circuitUse the fuse plan to see what the fuse powers.
  2. Note when it blowsImmediately, or only when a certain item is switched on.
  3. Look for chafed wiresCheck where wiring passes through doors and hinges.Never replace a fuse with a higher rating.

Questions that narrow it down

  1. Does it blow at once?A short circuit is likely.
  2. Only when an item is used?That item or its motor is suspect.
  3. Was there recent work or accessories?Added wiring often causes shorts.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Short to earthChafed wiring.
  2. Seized motorDraws excess current.
  3. Faulty componentInternal short.
  4. Water in a plug or lampShort in wet conditions.
  5. Poor aftermarket wiringAccessories added later.

Questions about Fuse Keeps Blowing

Can I use a bigger fuse?

No. That removes the protection and can cause a fire.

Is it always expensive?

Not always; finding the short takes time, but the fix may be simple.