Help with Multimeter to diagnose wiring issue

[jpoprock]

Hey guys!

I posted this some time back and i've not yet resolved it. I'm thinking of trying to, but I need advice.

http://www.explorerforum.com/forums/showpost.php?p=2958370&postcount=16

I did check for a blown fuse and didn't discover any. The weird thing is, my lights used to work no problem. My hitch jack is fairly corroded though. So I was thinking that it might be the jack that is bad, or perhaps the wiring is broken under the truck somewhere.

I figure that if i can remove the jack plate and put a multimeter on the wires, that will rule out the wires being bad right?

So my question is, what setting to I put my multimeter to, and what do I touch the red wire to and the black wire to? Will I have to engage the turn signals, etc to get the reading, or will I get a reading regardless?

Thanks!
Jason

 

[Tbars4]

..This should get you started..