Marker Lamps - GMC TopKick 2007 Owner's Manual

When the DRL are on, only your headlamps will
be on. The taillamps, sidemarker and other lamps
won't be on. Your instrument panel won't be lit
up either.
When you turn the headlamps off, the regular
lamps will go off, and your low-beam headlamps
will change to the reduced brightness of DRL.
To idle your vehicle with the DRL off, set the
parking brake. The DRL will stay off until you
release the parking brake.
As with any vehicle, you should turn on the
regular headlamp system when you need it.
150
When it begins to get
dark, your DRL indicator
light is a reminder to
turn the headlamps on.
The other lamps that
come on with your
headlamps, will
also come on.

Marker Lamps

If your vehicle has this feature, you can manually
blink the marker and clearance lamps.
Press and hold the bottom of the switch to turn off
the marker and clearance lamps. When you
release the switch, the marker and clearance
lamps will come back on.
The marker lamp defeat
switch is located in the
instrument panel
switchbank.