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The 1156 bulb has one filament in it, which means it only lights on or off. The 7506 on the other hand, has two filaments. The first filament is usually lit up when the headlights or auxiliary lights turn on, and alike the 1156 bulbs (they are usually used for taillights) they light up when they get the second side with voltage sent through them.

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12y ago

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