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What would cause a brake light fuse to keep blowing?
The simplest possibility is the bulbs (brake light bulbs) on the circuit have corroded and the contacts have melted such that they touch creating a short. Another bulb related fault occurs if the filaments in a dual filament bulb short together.
How do you test the brake warning light circuit?
Turn on the ignition and get your helper to hold the brake pedal down. Touch the centre contact of the bulbholder with the test lamp probe. If the test lamp lights, current is reaching the bulb and the fault lies with the earthing. Check and clean up the earth side of the circuit.
How do you check the brake light circuit?
Check and clean up the earth side of the circuit. If the test lamp fails to light, next check if current is reaching the fuse by probing each fuse terminal in turn with the test lamp. If the lamp lights on the battery side of the fuse, the fault is in the fuse itself.
Why does my brake light fuse keep blowing out?
If so, the fuse is functional, and the problem most likely is a used-up brake light bulb. If, however, the test light illuminates when the connection is only pressed against one side of the fuse, the fuse is faulty. If the test light fails to light at all, regardless of where it’s connected to the fuse, you definitely need to replace the fuse.
When do I need to replace the fuse on my brake light?
If, however, the test light illuminates when the connection is only pressed against one side of the fuse, the fuse is faulty. If the test light fails to light at all, regardless of where it’s connected to the fuse, you definitely need to replace the fuse.
What should I do if my brake light does not come on?
If the light only illuminates on one terminal, the switch is faulty and should be adjusted or replaced. To check this, disconnect the wires to the switch and join them together. The brake lights should now come on. If both terminals cause the lamp to light, the fault lies in the wiring between the switch and the brake lights.