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Old 09-30-2009, 07:31 PM   #1
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1995 30' Limited
Tygh Valley , Oregon
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What's going on with my tail lights?

I own an 87 Sovereign. It has 4 red taillights - 2 on each side. My tow vehicle has daytime running lights so the taillights are always on. All 4 of the taillights glow fine when I'm not using the brakes or turn signals. When I put my foot on the brakes the left side works properly - both of the taillights glow brighter. On the right side the outside taillight glows brighter but the inside taillight goes out. When I turn on the left turn signal both taillights blink in unison. When I turn on the right turn signal the lights alternate - when the inside light is on the outside light is off and vice versa.

What's my problem?

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Old 09-30-2009, 07:37 PM   #2
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Tell us about your tow vehicle so that we can help.


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Old 09-30-2009, 07:38 PM   #3
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1978 31' Excella 500
Venice , California
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You probably have a bad ground somewhere. Ground loops give mysterious symptoms.
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Old 09-30-2009, 08:14 PM   #4
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1977 Argosy Minuet 6.0 Metre
Cape Coral , Florida
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I have no reason to think it's the problem, but have you changed the bulb on the inside right tail light?
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Old 09-30-2009, 09:52 PM   #5
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Salem , Oregon
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Hi, you either have a bad ground or a bad light bulb on the right inner side. The bad contact can be a rusty or corroded socket.

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Old 10-01-2009, 07:04 AM   #6
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2005 16' International CCD
Wimberley , Texas
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I don't think the tail lights are supposed to come on with the daytime driving lights (at least on my GM tv). If it is a GM the driving lights are seperate from the lighting system and head and tail lights should not come on until dark, or if the sensor on the dash is covered by something. I don't know if your tv/as worked together in the past, but if they have not been used together previously the wireing may not be the same on both vehicles. Otherwise, the previously mentioned bad bulb or ground is a good place to start.

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