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2008- 2010 General Questions General questions related to 2008-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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Old 03-15-2010, 01:52 PM   #1 (permalink)
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Trailer Turn and Brake lights don't work

My truck has lights that work as does my trailer. However, connect the two and the trailer brake and turn signals don't work. I checked at the plug and get nothing from there except brake, charge, and running lights. I know there are 2 locations for fuses but haven't found any bad ones yet. What do I do now? Is there a single place that would control both sides at once? If there's a fuse under the hood that's bad, there'd have to be two of them bad. I've got a long trip coming up this weekend and need some fast assistance.

Thanks!


Thanks wp6529 and MPD56! Although I thought I had checked that fuse (missed it by one place... should have rechecked), that was indeed the problem. You guys have saved me lots of troubleshooting time. I am in the Air Force and am moving my family next week and couldn't figure out the thing but was willing to chance the trip with no trailer lights because I'm running out of time. Because of you two, it only took me 5 minutes to read the forum, 5 minutes to fix it, and 5 minutes to update this! Safe again!
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Last edited by Ty Pope; 03-15-2010 at 07:15 PM. Reason: The problem is fixed!
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Old 03-15-2010, 02:22 PM   #2 (permalink)
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My truck has lights that work as does my trailer. However, connect the two and the trailer brake and turn signals don't work. I checked at the plug and get nothing from there except brake, charge, and running lights. I know there are 2 locations for fuses but haven't found any bad ones yet. What do I do now? Is there a single place that would control both sides at once? If there's a fuse under the hood that's bad, there'd have to be two of them bad. I've got a long trip coming up this weekend and need some fast assistance.

Thanks!
Per my 2009 diagram, which should be the same, both trailer turn signal/stop/hazard relays are fed from 25A fuse F34 which is listed as being located in the "battery junction box" under the hood near the brake master cylinder. The trailer relays are also listed as being in this location. The parking light and charge relays are fed from fuses F42 and F44.
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Old 03-15-2010, 03:12 PM   #3 (permalink)
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My 2008 diagram shows the same as wp6529 wrote. The control signals to both relays(20&21) comes from a smart junction box (SJB 11-3), so if both relays are working, I would suspect fuse F34. Let us know what you found.
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Old 03-15-2010, 07:16 PM   #4 (permalink)
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Per my 2009 diagram, which should be the same, both trailer turn signal/stop/hazard relays are fed from 25A fuse F34 which is listed as being located in the "battery junction box" under the hood near the brake master cylinder. The trailer relays are also listed as being in this location. The parking light and charge relays are fed from fuses F42 and F44.
F34 was it! I checked the one next to it in error. I wasn't planning on rechecking it. You've saved me lots of time. Thank you.
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Old 03-15-2010, 07:21 PM   #5 (permalink)
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My 2008 diagram shows the same as wp6529 wrote. The control signals to both relays(20&21) comes from a smart junction box (SJB 11-3), so if both relays are working, I would suspect fuse F34. Let us know what you found.
F34 was it! I checked the one next to it in error. I wasn't planning on rechecking it. You've saved me lots of time. Thank you.
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Had: 2008 F-450 6.4 Lariat
1992 F-250 Straight 6 XL (buy/fix/sell)
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2002 F-250 V10 Gasser (never again) Lariat
2001 F-350 7.3 Lariat
1996 F-150 XLT
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Old 03-16-2010, 01:39 AM   #6 (permalink)
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Glad it worked out.

Thanks for the update.
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- 2013 F350 CC 4X4 Lariat SRW, Black.
Ordered Dec 2012 - Built Jan 11th 2013 - Picked up Jan 31, 2013.
- 2013 Ford Edge
Built Nov 26 2013 - Picked up Dec 06 2012
-2008 F-350 CC 4X4 Lariat, SRW, 3.73.
Any color, as long as it's "Black".
Ordered 12/31 - Born 02/11 - Picked up 03/29.
-1972 First Ford - 1956 Fairlane - Mint
Rolled it at 100+mph (Teenager, Duh, no one hurt)
Totaled Oct/73 (Over 35 Years ago and still remember that lesson).
-First New Ford - 79 Bronco - Ordered Mar/79
150K Miles - I disassembled 2000 and I sent it to three different scrap yards.
-1982 - My Sister married a GM Sales Manager (He Retired, "Hello" Ford Super Duty, enough said, LOL).
-2003 - ZRX1200 (Some say "Mid Life", LOL).
-2008 - Jayco 313RKS 5th Wheel.
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Old 06-22-2010, 06:05 PM   #7 (permalink)
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New to the board. Found this thread with search. I had this same problem. Fixed! Thanks fellas. This site is great....
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Old 08-09-2010, 07:13 PM   #8 (permalink)
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I'm having issues with my running lights on two of my trailers, everything works on both except for running lights. Checked receptacle and no power on that terminal.Manual shows location 55 under the hood as Trailer tow parking lamps, but nothinig for running lights and this looks like a relay, so I can't tell if it is bad. Is this the relay/fuse responsible for my running lights and if so how do I test to see if it bad before purchasing a new one.

08 Super Duty

Thanks in advance,
Imspuds
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Old 08-10-2010, 10:29 AM   #9 (permalink)
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Imspuds: I don’t have my diagram or manual with me at this time. But will look later if no one responds. I believe that fuse F42 supplies the power to the trailer running lights and the relay. Without the information beside me, if the fuse (F42) is good and you suspect the relay, there might be another relay the same be side it and you can swop them and verify that the relay is working.
__________________
- 2013 F350 CC 4X4 Lariat SRW, Black.
Ordered Dec 2012 - Built Jan 11th 2013 - Picked up Jan 31, 2013.
- 2013 Ford Edge
Built Nov 26 2013 - Picked up Dec 06 2012
-2008 F-350 CC 4X4 Lariat, SRW, 3.73.
Any color, as long as it's "Black".
Ordered 12/31 - Born 02/11 - Picked up 03/29.
-1972 First Ford - 1956 Fairlane - Mint
Rolled it at 100+mph (Teenager, Duh, no one hurt)
Totaled Oct/73 (Over 35 Years ago and still remember that lesson).
-First New Ford - 79 Bronco - Ordered Mar/79
150K Miles - I disassembled 2000 and I sent it to three different scrap yards.
-1982 - My Sister married a GM Sales Manager (He Retired, "Hello" Ford Super Duty, enough said, LOL).
-2003 - ZRX1200 (Some say "Mid Life", LOL).
-2008 - Jayco 313RKS 5th Wheel.

Last edited by MPD56; 08-10-2010 at 10:32 AM.
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Old 08-11-2010, 12:31 PM   #10 (permalink)
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Imspuds: I donít have my diagram or manual with me at this time. But will look later if no one responds. I believe that fuse F42 supplies the power to the trailer running lights and the relay. Without the information beside me, if the fuse (F42) is good and you suspect the relay, there might be another relay the same be side it and you can swop them and verify that the relay is working.
MPD56,
Thanks for your time, found fuse issue, all is working properly.
Regards,
Impsuds
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Old 08-28-2014, 02:01 PM   #11 (permalink)
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Per my 2009 diagram, which should be the same, both trailer turn signal/stop/hazard relays are fed from 25A fuse F34 which is listed as being located in the "battery junction box" under the hood near the brake master cylinder. The trailer relays are also listed as being in this location. The parking light and charge relays are fed from fuses F42 and F44.

Same issue, F34 was it, relays good, everything works.

Thanks guys.
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