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2004 Dodge 3500 Trailer turn signal #1577688 02/11/14 11:14 PM 02/11/14 11:14 PM
Joined: Aug 2003 Posts: 775 Big Wonderful Wyoming! T toomanymopars OP super stock
toomanymopars OP super stock T Joined: Aug 2003 Posts: 775 Big Wonderful Wyoming!	I have a 2004 Dodge 3500 Cummins. Right trailer turn signal and brake light do not work. Lights on truck work properly. It is not a problem with the trailer wiring. Wire all the way from the under hood fuse box to the trailer light plug is good. Fuse is good...power to both sides of it. Replaced FCM with used unit that is supposed to be good, and it didn't cure it. Any ideas as to what is wrong? Fuse box itself bad?

Re: 2004 Dodge 3500 Trailer turn signal [Re: toomanymopars] #1577689 02/11/14 11:21 PM 02/11/14 11:21 PM
Joined: Feb 2010 Posts: 1,377 Ohio Todd pro stock
Todd pro stock Joined: Feb 2010 Posts: 1,377 Ohio	If the wiring like you said more than likely the TIPM is bad (fuse box). Very common problem with those.

Re: 2004 Dodge 3500 Trailer turn signal [Re: toomanymopars] #1577690 02/11/14 11:49 PM 02/11/14 11:49 PM
Joined: Jan 2003 Posts: 18,425 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,425 UPPER MICHIGAN, MARQUETTE COUN...	There is separate fuses for the trailer tow circuits. With a blown trailer circuit fuse the truck functions will still work. Double check the fuses.

Re: 2004 Dodge 3500 Trailer turn signal [Re: NITROUSN] #1577691 02/12/14 12:03 AM 02/12/14 12:03 AM
Joined: Aug 2003 Posts: 775 Big Wonderful Wyoming! T toomanymopars OP super stock
toomanymopars OP super stock T Joined: Aug 2003 Posts: 775 Big Wonderful Wyoming!	I know that there are separate fuses for the trailer...#46 and 47 I believe. Both are 15 amp fuses...have power on both sides of the fuse, so they are for sure good. I am pretty sure that it is the TIPM, too, but looks like used ones are around $200 and up...fine if it fixes it.

Re: 2004 Dodge 3500 Trailer turn signal [Re: toomanymopars] #1577692 02/12/14 12:50 AM 02/12/14 12:50 AM
Joined: Jan 2003 Posts: 43,590 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,590 Round Lake Beach, Illinoisy	My 04 has been like that for 8 years now. I was told it was the FCM (forward control module) under the drivers side battery box, but finally changed it out this year with no change. It is probably a wiring issue but I haven't found it yet, I am just more careful when turning right. Now I see that it might be the TIPM? Let me know if it fixes your problem... Last edited by Rhinodart; 02/12/14 12:52 AM. The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: 2004 Dodge 3500 Trailer turn signal [Re: Rhinodart] #1577693 02/12/14 04:03 AM 02/12/14 04:03 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I agree with Todd as I have replaced a few TIPM's on the trucks for problems with lights over the years before I retired. Ron

Re: 2004 Dodge 3500 Trailer turn signal [Re: toomanymopars] #1577694 02/12/14 09:33 PM 02/12/14 09:33 PM
Joined: Jan 2003 Posts: 18,425 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,425 UPPER MICHIGAN, MARQUETTE COUN...	Quote: I know that there are separate fuses for the trailer...#46 and 47 I believe. Both are 15 amp fuses...have power on both sides of the fuse, so they are for sure good. I am pretty sure that it is the TIPM, too, but looks like used ones are around $200 and up...fine if it fixes it. Yes it is fuse #47. The front control module pin 34 ends a ground signal to the TIPM right turn relay #86 which causes the right turn relay to latch. Fused power From #47 fuse powers the relay #30 terminal and once latched sends power to #87 which is the right turn wire and it is light green[no tracer] in color. If I remember correctly the relay is incorporated into the TIPM module and is not service able.

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