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Old April 13th, 2011, 08:06 PM   #1
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Trailer wiring issue. brake light and turn signal don't work with head light on

The brake light and turn signals work when the headlights are off, but when I turn the headlights on, the turn signals and brake light no longer do anything, it just stays lit. Trailer lights are 2 wire, dual filament, and ground to frame.
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Old April 14th, 2011, 06:58 AM   #2
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turn headlights off.
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Old April 14th, 2011, 09:50 AM   #3
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Check ground, don't you remember when my Sonoma did this? My tailights drew so much power my headlights went out.
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Old April 14th, 2011, 09:58 AM   #4
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Quote:
Originally Posted by Quiefinator View Post
Check ground, don't you remember when my Sonoma did this? My tailights drew so much power my headlights went out.
Fresh ground on truck and trailer side. From what I've read it sounds like I have the taillights hooked up to the bright filament, and have the brakes and turnsignals hooked up to the dim filament.
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-1985 V65 Magna
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Old April 14th, 2011, 07:33 PM   #5
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if your grounds are 100% then most likely what you said with Running lamps wired to Stop/turn wire.
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Old April 14th, 2011, 08:02 PM   #6
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Quote:
Originally Posted by Mclovin View Post
if your grounds are 100% then most likely what you said with Running lamps wired to Stop/turn wire.
Swapped the wires and now all the lights work great.
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-2001 Tahoe original 5.3 4x4 only 430k
-A Metric Butt ton of three wheelers
-1985 V65 Magna
-1983 Nighthawk 650
-1969 F250 Highboy built 360
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Old April 14th, 2011, 08:15 PM   #7
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Quote:
Originally Posted by booblinker View Post
Swapped the wires and now all the lights work great.
been there.. gotta love it when the co. paints the trailer with the wiring on and you cant tell wire colors.
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Old April 14th, 2011, 08:18 PM   #8
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Originally Posted by Mclovin View Post
been there.. gotta love it when the co. paints the trailer with the wiring on and you cant tell wire colors.
Ha this was all me, new lights and new wiring, the light I bought didn't tell me which color was high and which was low, and I didnt even think about it.
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-A Metric Butt ton of three wheelers
-1985 V65 Magna
-1983 Nighthawk 650
-1969 F250 Highboy built 360
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