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Old 11-03-2015, 11:58 AM   #1
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1973 25' Tradewind
New Smyrna Beach , Florida
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Stop and turn signal

Drivers side tail light is not working properly. When lights are on I get a steady bright light but no turn or stop signal. I have changed out the bulb holder and CRCd the plug-ins (both male/female) and the results are the same. No turn or Brake light when lights are off either. Any clues. Thanks

73 Tradewind
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Old 11-07-2015, 11:04 PM   #2
cwf
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Howdy! Gee, no one jumped in to help.. So here goes...

Did it ever work? If so, read on.

Get a "circuit tester". It is like an ice pick with a lamp inside and a wire coming out. They are a ailable at automotive parts stores... Got mine at O'reillys.

The wire goes to "ground" and you "probe" the circuit you want to verify.

Put the "flashers" onCheck the truck connection first. Does the tester flash when touching the "left" turn circuit contact?? Yes?? Truck is "ok".

Connect umbilical to the truck... Go to rear of trailer.. Probe the contacts...(do not forget to ground the tester).. Does tester flash? Trailer wiring ok if it does.. If not, problem in trailer or umbilical ones your umbilical detach from trailer! Test circuit at end of umbilical (ground to truck).. No lights? Bad umbilical.

Let us know result.
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Old 11-08-2015, 03:27 AM   #3
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1973 31' Sovereign
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Everything CWF says and:

Hey daanderson:

Everything cwf says plus:

1) Check your tester to make sure it works. There’s nothing like poking things, including your fingers, before you figure out your tester is bad. Ask me how I know this.
2) Check continuity of your ground wiring. If your trailer is not grounded to the tow vehicle thru the ground wire, you can have bizarre electrical behavior. Unhitch the trailer to eliminate grounding thru the hitch, safety chains, or weight distribution bars.


When you check for the turn signal at the truck’s 7 way connector, use the connector ground pin for your ground. You need to verify that the truck 7 wire connector ground completes the circuit.

When checking the umbilical cord, do the same—use the ground pin in the umbilical cord connector for your ground. You need to verify that the umbilical cord ground completes the circuit.

Check the 7 way connector connections inside the trailer. There is a plastic cover in the front wall of the trailer, which, when removed, reveals the back side of the trailer connector the umbilical cord plugs into. Again verify circuit completion thru the ground post.

The trailer connector ground post is wired to one or more studs or bolts welded on the trailer frame. If the ground connection is intact, the trailer frame and inner and outer shells, are grounded, so your tester should flash when placed between the turn signal post and either the inner shell or frame.

One final comment. Exposure to the elements may have tarnished the pins and sockets of your umbilical cord , truck connector, and trailer connector. You can buy specialized cleaner tools to clean the tarnish. The pins of some connectors, like the old Bargmann, are split and can become compressed so they no longer make good electrical contact. Gently spreading the pins open with a thin bladed knife can restore proper contact. Be gentle—you can spread them too far or even break them.
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Old 11-09-2015, 05:18 PM   #4
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Thanks Much Guys! I think I have it isolated to the umbilical cord. Have one ordered. I let you know.
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Old 11-09-2015, 05:26 PM   #5
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The 73 Airstream umbilical was wired unique to Airstream. Now all are wired to an industry standard. If your Airstream was not rewired to match the standard the problem may not be in the umbilical but the way the AS is wired in the 7 way connector.
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Old 11-11-2015, 03:41 PM   #6
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1973 25' Tradewind
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Thanks to all. It was the cord (truck side). Spreading the pins and a good cleaning fixed the problem. Replaced the rusted light cans with the newer aluminum ones. Had to drill holes for the screws and fiber optics but all is well. Thanks again for the help. As always I should have asked first as I have been playing with this issue for weeks. Thanks again
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Old 11-11-2015, 03:48 PM   #7
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Great! Thanks for update!!!
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Old 11-11-2015, 10:24 PM   #8
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Oh hey, since you are talking about your new replacement tail light cans, I'll share a tip someone else shared with me. Water can get into your trailer by passing by the cans. The fellow recommended rolling up a bead of plumbers putty and squishing it around the cans. Don't use anything more permanent like sitka flex though... just in case you ever have to get back in there to play with the wiring
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