Have an 03 3500 with factory tow package, but the left turn signal does not work at the trailer plug. fuse is good but I cant hear the relay sorking in fuse panel. any ideas would be greatly appreciated

 

dunno check make sure that the wire is connected well into the trailer plug. if not go and trace the wire and look for a break.

 

If you are using an adapter try a different brand or maybe it is bad.

 

I have no power in the wire at the back of the cab. the right side works just fine. I am not sure if the relay for that function is built into the fuse box, becouse it seems like the relay for the right side is inside the box some how

 

I am pretty sure a module controls blinkers instead of a relay or flasher tube on CRs. I could be way off though....

 

On the 03, it should be fused under the hood...pull the cover and check all the fuses, I am pretty sure there are left and right turn signals, and tail lights, as well as a maxi-fuse for the 12-volt lead. Likely a bad fuse.

For what its worth, the relays used to control the turn signals are at their limit when fused at the OE rating. You will do yourself a favor if you reduce each of the trailer turn signal and tail light fuses by 5 amps (in other words, if its got a 15 amp fuse, put in a 10 amp)...

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This was a mid/late-05 thing...the PCM has a resetable circuit breaker, but it can only be reset so many times before you replace the entire PCM (for around $600 the last time I heard).

The early 3rd gens (03 and 04) had relays and fuses for each one, and while the relays can go bad; if you know someone handy with electronics they can replace just the relays.