What does the yellow exclamation sign under the D on intrument panel mean for 2008 jeep unlimited wrangler

SOURCE: Jeep 2008 unlimted trailer wiring

http://www.etrailer.com/instructions.aspx?pn=118416

Also MOPAR has a similar wiring solution
take a look at the instructions --the visual description is better in the MOPAR manual
http://www.quadratec.com/Assets/Installation/75396.pdf

SOURCE: yellow horshoe light with exclamation point in middle

thats your TPMS light, Tire Pressure Monitoring System. The light means that one of your tires is low on air, so check them all and fill them to the specified amount, which will be located on the drivers side door jamb.

SOURCE: The hand brake warning light is showing yellow when the handbrake is not on plus the the panel is showing a further warning of an exclamation mark within a triangle within an incomplete circle. What d

It sounds like the DSC fault that I have on my 320ci, apparently I need a new steering angle sensor.

SOURCE: How to change alternator on 2005 Jeep Wrangler

Straight out of the repair manual:

REMOVAL
WARNING: DISCONNECT NEGATIVE CABLE FROM BATTERY BEFORE REMOVING BATTERY OUTPUT WIRE (B+ WIRE) FROM GENERATOR. FAILURE TO DO SO CAN RESULT IN INJURY OR DAMAGE TO
ELECTRICAL SYSTEM.
(1) Disconnect negative battery cable at battery.
(2) Remove generator drive belt. Refer to 7, Cooling System for procedure.
(3) Remove generator pivot and mounting bolts/nut (Fig. 2) , or (Fig. 3). Position generator for access to wire connectors.
(4) If equipped, unsnap plastic cover from B+ terminal.
(5) Remove B+ cable output terminal mounting
nut at rear of generator (Fig. 4), (Fig. 5), or (Fig. 6). Disconnect terminal from generator.
(6) Disconnect field wire connector at rear of generator by pushing on connector tab.
(7) Remove generator from vehicle.
INSTALLATION
(1) Position generator to engine and snap field
wire connector into rear of generator.
(2) Install B+ terminal to generator mounting
stud. Tighten mounting nut. Refer to Torque Specifications.
(3) If equipped, snap plastic cover to B+ terminal.
(4) Install generator mounting fasteners and
tighten. Refer to Torque Specifications.
CAUTION: Never force a belt over a pulley rim using a screwdriver. The synthetic fiber of the belt can be damaged.

SOURCE: 2005 Jeep Wrangler Unlimited cruise control will not engage.

check the vacuum line on the right side of the engine. There should be an elbow connector connecting the line to the engine. Does interior fan only come out of the defroster vents by chance?