2003 dodge ram 1500 remote start

I'm trying to install a remote start on a 2003 Dodge ram 1500. I have a thick (about 10 guage) wire in the IGN harness that is red with a white stripe. The wire is not testing any voltage, negative or positive. This is the same whether the ign is off, in run, or if the starter is cranking. Any ideas? All the wiring diagrams say I should have a RED / white 12v wire AND a RED / white ign3 wire. I found a thinner wire, about 16guage that is 12v all the time. So what is this 10 guage wire supposed to be???

The RED / white 10 ga is a +12v supply to the ignition switch, it supplys power to the 10 ga DB (dark blue) wire coming from the ignition switch when the key is in the run/acc position. If you don't have voltage to it then fuse 9 in the integrated power module is blown or your trucks trim package doesn't make use of it. There is a red (16 ga) and a RED / white (14 ga) +12v supply to the switch. There is also a RED / white (16 ga) that is hot in the off/run/start position as well. Hopes this helps, I know all the RED / whites are confusing but I believe that was dodge's intention for someone messing with the ignition wiring.

I checked all the fuses and none are blown. However, the blue wire is hot when the key is in the run position even though I'm not reading any voltage on the thick RED / white wire. I'm also reading an orange and a green wire as hot when the key is on, but no voltage when the key is off.

This is the wiring diagram for the ignition switch. There are two DB (dark blue) wires listed, one 10 ga and the other is 16 ga. Does your truck have power windows? I believe the RED / white 10 ga and DB 10 ga are for power windows and the like.

No power windows, no power locks. V6 engine.

Well that explains your 10 ga RED / white, it's not used on your truck.

Ok, I got it done. I didn't connect that RED / white to anything. The tach learning is a PITA on Dodges. I finally got it all done though. Thanks for the info.