2004 F-350 4x4 psd no stops or turns on trailer, tailights ok. Have ck'd fuses on main panel and under hood ok. relays are clicking and ck ok. bridged terminals at relay turn signal pulse from dash is present however no other power for relay. wires to rear cks out ok also. is there another relay that supplies 12v to turn relays or should I suspect a bad panel board? dealer has been no help and I cannot find wiring diagrams anywhere.

 

anybody any ideas?

 

Power distribution for the trailer tow lamps is on the F2.6 20amp in the CJB.. Make sure to check the fuse block 'connections' for snug as well as the fuse for an open.. I've seen fuse tap/adapters inserted 'along side' the fuse that can spread the terminals inside the panel causing a loose/bad connection or an open.. You should have 12v 'hot at all times' on the #30 terminal on the relay connection/position, and the flash pulse on the #86 from the multi function/flasher.. Ground on the #85, and the load or lamps on the #87.. Bridging the 30 and 87 won't prove out the circuit on back unless there's 12v on the #30 coming in.. Might check the ground near the wiper motor firewall area it's the relay/s coil ground, but If the trailer tow relays are clicking, and at a normal rate, chances are the ground is good.. The power distribution wire 'into' the Aux relay box for the turn relay coils (R&L positive) is DG/OG wire.. You might try and add 12v there, and if the turn switch pulse and the relay coil grounds are ok, then the lamps should function..

 

Here's a quick diagram for the relay socket for terminal position..

[IMG]local://upfiles/6756/EEC09A1391F745C7B59AB0523A3EA222.gif[/IMG]

 

Hayapower,
Thanks for the reply , I'll ck the fuse panel connections, believe the problem lies there somewhere. If it gets too involved I will repower the relays . I did have that same thought also but just wanted to make sureI wasn't missing an easy fix to theproblem.
What ever the out come, I'll let you know FYI.
Thanks again for the help