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Old 07-07-2015, 08:36 AM   #1
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Running lights flashing when using directional.

Own a 2011 x23j, last month we had to have wiring underneath replaced due to pup chewing wiring to brake and both tanks. Picked up trailer a few weeks later, first had trouble with one of the tail lights not working, fiddled with light and got both working, no problem coming home with lights, (son was following behind) During the short trip of back roads never really felt like the brakes were grabbing. Didn't think much of it, though I slide the brake controller over to high and didn't feel the usual pull when doing that.
Talked to a neighbor and fellow TT owner about it. He suggested that I hook up the tt to tv and have someone press on the brakes and listen for the hum in the hub as they are magnetic.
Did that yesterday and couldn't hear a thing, plus, my lights started acting screwy. First, just one tail light only, (with tv lights on), fiddled with pig tail and all lights came on, (including running lights) but when I went to check directions, ALL lights started flashing. (including running lights) Fiddled again with pig tail and tv connector, got all lights to work correctly. Haven't move it yet to check brakes and brake lights.
Am a newbie with TT and no electrical experience but was wondering if flashing lights are an indication to something.
First thought is the repair place screwed up the wiring but now inclined to think maybe the connector on tv or pig tail.
Would like any thoughts or input on the matter, they would be greatly appreciated. We are scheduled to head out at the end of the month. Bluegrass festival in N.H. and then on to Lake George in N.Y. BTW, TV is a 2001 f150.
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Old 07-07-2015, 08:44 AM   #2
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Sounds like a weak ground to me.
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Old 07-07-2015, 08:52 AM   #3
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Sounds like a weak ground to me.
Agreed. Sounds like a weak ground. If everything worked fine before the pup chewed things and before the repair shop, you may want to check everything over from tongue to tail paying close attention to all grounding points. Sometimes there is corrosion at a grounding point and when a repair shop does a repair they don't always clean an area off before completing the repair and connected a new ground to a corroded area.
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Old 07-07-2015, 08:57 AM   #4
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Agree also that it's probably the ground. I get this too from time to time, especially in the spring when it hasn't been connected for a while. You might also want to spray the contacts on the 7 pin connector, both TV and trailer, with contact cleaner.
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Old 07-07-2015, 09:27 AM   #5
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Where did the dog chew the wiring at. The main wiring harness or elsewhere? Also if you can post a pic of that area.
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Old 07-07-2015, 10:40 AM   #6
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Get a pin-out of the 7 pin connector (plenty of pix online)


Since 12V hot is available at the connector, jumper to each use in turn to see if everything is hooked up properly.


To test the brake magnets, jack up a wheel and have an assistant spin it when you momentarily apply full power to the brakes.


The title to your post says the running lights were flashing. The signal to the brakes is a pulse-width-modulated square wave. If you hooked a lamp to the output of a brake controller, you would see the lamp flicker depending on how much trailer braking was being called for.


Again, check that the repair was done 100% correctly first. Then search for more exotic issues (bad grounds, chaffed wires, poor connection to the tow, etc.).
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Old 07-07-2015, 11:07 AM   #7
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Originally Posted by mike837go View Post
Get a pin-out of the 7 pin connector (plenty of pix online)


Since 12V hot is available at the connector, jumper to each use in turn to see if everything is hooked up properly.


To test the brake magnets, jack up a wheel and have an assistant spin it when you momentarily apply full power to the brakes.


The title to your post says the running lights were flashing. The signal to the brakes is a pulse-width-modulated square wave. If you hooked a lamp to the output of a brake controller, you would see the lamp flicker depending on how much trailer braking was being called for.


Again, check that the repair was done 100% correctly first. Then search for more exotic issues (bad grounds, chaffed wires, poor connection to the tow, etc.).
While I understand how PWM works I have never heard of one used for RV's. Who manufactures this type of controller?

Most brake controllers are of the proportional variety. It only varies the voltage applied to the brakes. Not PWM.
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Old 07-07-2015, 11:29 AM   #8
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While I understand how PWM works I have never heard of one used for RV's. Who manufactures this type of controller?

Most brake controllers are of the proportional variety. It only varies the voltage applied to the brakes. Not PWM.
I won't argue the point. Having had CRS most of my life, I am usually confident in what I do remember. Though, I have been known to be wrong a time or two.

Time to re-read the manual.
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Old 07-07-2015, 11:34 AM   #9
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Thanks for input guys, will try all suggestions. Consensus is a bad ground somewhere on trailer? Will check as well as test brake magnets. Took for test drive, lights were working, not feeling any braking motion. Red light on brake controller shines bright but not feeling anything. During test drive, left tail light would be on but no brake light or turn signal. Stopped and jiggled pigtail, light worked properly.
BTW, called repair place this morning to see if I could bring it in for them to check, CLOSED for vacation this week, sumbitch.
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Old 07-07-2015, 11:35 AM   #10
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Bedrck 46 Will post pics in awhile, been at this all morning, need a bite to eat.
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