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Message: <blockquote data-quote="dcairns" data-source="post: 29565" data-attributes="member: 15461">2003 Silverado.  The tail lights have an upper bulb that functions as brake (bright) and marker light (dimmer with headlights on). The middle bulb seems to do nothing. I have had my truck so long I forgot what the middle bulb is supposed to be doing.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite12" alt="o_O" title="Er... what?    o_O" loading="lazy" data-shortname="o_O" />  Below the middle bulb, are the reverse lights, and they work fine. Anyone remember how the middle bulbs are supposed to behave?  I probably need to check fuses and get out the volt meter and see if the wiring/sockets are good.<EDIT>  oh never mind... I forgot to check TURN SIGNALS... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes    :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></blockquote>