Posted: Nov 18 2004 at 6:38pm | IP Logged

Hi all.  I am new to this forum and I have a question that hopefully someone can answer because the dealer most certainly COULD NOT.

My truck's tail lights are working fine, but I have no running lights on my boat trailer.  They were working fine 2 days ago but now they aren't.  I have brake lights and turn signals, but no running lights.  I have searched everywhere for a fuse for them but can find nothing.  There is nothing in the owners manual or anything labeled in the fuse box for trailer lights.  I was on the phone 3 times today with the dealers service dept.  One lady told me to look under the back near the wiring harness for a small black box that contained a small fuse for the trailer lights.....I never found a little black box or any fuse.  When I called back and spoke with another guy, he told me it was my trailer wiring that was bad, which it most certainly IS NOT.  I was testing it coming out of the truck!  turn signals and brake lights, but no running lights..

Anyone have a clue???  I am racking my brain here.  There has to be a fuse or burnt wire or something!

Thanks for any help!

Posted: Nov 20 2004 at 9:50am | IP Logged

Hendo wrote: anyone have a clue?

OK, how about a wiring diagram?

Posted: Nov 21 2004 at 5:41am | IP Logged

On my LE w/tow package there is a black plastic box sitting crossways directly behind the gas tank.  I saw at least one wiring harness connector attached to it.  I don't know what it is or if it can be opened.  Might this be what you're looking for?

Rick

Posted: Nov 21 2004 at 10:24pm | IP Logged

OK, for anyone else that experiences this problem....found this....

 Seems there is a large fuse box behind the small box that contains the relays for the trailer tow package, in this box is a 10 amp fuse labeled trailer tow.. (was blown) I did not see any reference to this box in the owners manual.. I really can't believe that the dealership did not know about this!!!

Posted: Nov 22 2004 at 4:24am | IP Logged

Where exactly is this box located??

  I don't want to have to go through what you did to fix this problem.

Rick

Posted: Nov 22 2004 at 11:02am | IP Logged

OK, when you pop your hood, your battery is on the left.  Directly behind your battery is a small black box that contains around 5 relays.  BEHIND THAT box is a somewhat larger square black box.  Inside that box are about 20 other fuses that are not mentioned anywhere in your owners manual...and they are a lot of the key fuses too!  What really chaps my ass is that no one at the dealer's service dept knew of this other fuse box.  What a joke!  Aren't these guys trained on the newer vehicles???

Anyway, inside the lid of that second fuse box you'll see that there is a diagram with the fuses labelled.  The "trailer tow" taillights fuse is the 1st 10 amp fuse on the left in the second row of fuses.

Hope that is a little more clear for you.

Posted: Nov 22 2004 at 5:30pm | IP Logged

Copy that!!!  Thanks for the info.  I guess I just need to get my head under the hood and investigate some more.

Rick

Posted: Jan 18 2005 at 7:52pm | IP Logged

did you add the hitch yourself ?  had the same problem with mine after I put a hitch and 7-way plug on mine and read on another web site that you have to add a relay in one of those boxes under the hood to get the tail lights to work, all other lights will work without this relay...