Park, Tail, Marker, and License Lamps
The PARK/LAMP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to both the coil and switch sides of the PRK LAMP relay, also located in the I/P fuse block. When the headlamp switch is placed in either the PARK or HEAD position, ground is supplied to the BCM on the park lamp switch ON signal circuit. The BCM then applies a ground to the park lamp relay control circuit. This energizes the relay, applying voltage to all park, tail, marker, and license lamps. The park, tail, marker, and license lamps are also turned ON when the headlamps are commanded ON by the BCM for low light operation.
Ground for the headlamp switch is from G200. Grounds for the various lamps are as follows:
• G100 supplies the right front lamps
• G101 supplies the left front lamps
• G400 supplies the right rear lamps
• G401 supplies the left rear lamps
SOURCE: 2009 chevy expres trailer wiring harness
Ask dealer if it has a towing package on it. If it does, you usually just pop fuse in under hood for electric brakes, and harness to adapt into is usually near or at rear bumper. Even if it doesn't have brake wire, you should still be able to install adapter at rear,for lights etc. which is available from dealer or auto supply places, then you may have to run electric brakes separate.
SOURCE: need wiring diagram for 2008 ford crown victoria
Hello,
You can purchase the wiring diagram for $5.99 from the following site: http://www.wiring-diagram.com/. You can also purchase a wiring diagram book from the following link: http://cgi.ebay.com/ebaymotors/2008-FORD-CROWN-VICTORIA-MARQUIS-WIRING-DIAGRAM-MANUAL_W0QQitemZ120394723100QQcmdZViewItemQQimsxZ20090320?IMSfp=TL090320147007r15080.
Hope this helps,
Chris
SOURCE: trailer wiring harness diagrams W/o internet goose chase
Try this Link www.dodgeram.org/tech/mods/electric/trailer_wire.htm
Note the diagram for mil/malfunction indicator lamp. Wiring connector at instrument cluster, it appears pin 4, brown wire with white tracer, in my opinion that wire is ground controlled by the pcm, depending on the situation. The lamp needs voltage and ground, if the lamp itself is ok. good luck
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