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Some vehicles have pulse generating devices such as injectors that draw load on an on/off basis. It is done very quickly and the electrical system (regulator and alternator) can compensate for this. The voltage drops very quickly for a fraction of a second and then shoots back up. This causes most lights to pulsate. This usually goes away or is less noticeable at driving speeds or if a fairly high load is placed on the alternator i.e. if you turn your headlamps on. My Dodge diesel truck does this too and Dodge is known to be one of the worse when it comes to pulse generating devices.

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Q: Why do truck lights pulsate?
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