Question about 2003 GMC Sierra 1500
You have two problems the flashers are shorted. I would check the wire harness at rear off the truck. Possibly a trailer light harness has shorted at the plug most of these can be taken out of the harness and the two ends will plug together without the trailer plug.
Posted on Mar 21, 2009
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Posted on Jan 02, 2017
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Apr 27, 2017 | Cars & Trucks
Turn on the Durango and check each of the four turn signals
to make sure that the bulbs are not burned out. If you find one that has gone
out, replace the bulb and retest the turn signals. When a bulb goes bad on this
circuit, the resulting operation can mimic a bad flasher or one that is
Locate the combination turn signal flasher and relay. It is
on the left end of the driver's dash. Open the access door and view the
collection of relays and fuses. At the left side of the mounting block is a
larger flasher and relay. This is the combination turn signal flasher and
the relay by placing you finger on the relay housing and activating the turn
signal. If you have found the right one, you should feel a clicking as the turn
signal blinks. Remove the relay, replace with the new relay and close the
Start the Durango and activate the turn signals to check that they each work. The light should turn on and should blink. Also, check the hazard lights to make sure they work.
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