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You do not have the trailer lights connected properly.

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15y ago
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Q: Why do my Trailer tail lights go out when brakes are used?
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Which axle on a semi trailer is used for brakeing?

All axles have brakes on them.


Why do your lights go on when brakes are used?

When you press the brakes, the lights brighten up mainly to alert drivers behind you that you are slowing down or stopping. It prevents accidents


What is the problem on a 1987 Lincoln Town Car when the tail lights do not work while driving at night to be seen by other drivers but they work when you use the brakes turn signals and hazard lights?

Did you check for a fuse that says TAIL LIGHTS? The bulbs have 2 different filaments in them, one for just lighting the tail lights and the other filament is only used when braking, turn signal and flasher. There are 2 separate circuits. Look in your fuse box and see if you have a fuse for tail lights and see if it is blown. Although it looks like the same light, andin fact is the same bulb but with two different fillaments, the brake lights, signals and hazzards are on a different circuit than the tail lights, clearance lights and dash lights.


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What is a cheater bar on the trailer dump on a 18 wheeler?

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Dodge truck Tail light problem?

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What is Primary and secondry?

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