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Old 02-02-2015, 08:23 PM   #1
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Starstream's Avatar
1979 31' Sovereign
Spring , Texas
Join Date: Jun 2014
Posts: 271
HELP--My Exterior Lights Have Gone HayWire

My exterior lights seem to be possessed by something and I really need some help.

To begin with, we've changed all the exterior lights of our '79 to LED's. I added a resister to the left and right blinker because my '99 Expedition needed the extra stuff to make things engage. I have installed a new 7-way harness on the AS, a new 7-way connector on the expedition and a new and separate fuse block just for the 7-way. I've checked all of the fuses in the Expedition and all is good.

The clearance/marker lights, back-up lights, electric brakes, 12volt charge and ground are all fine and working properly. But the brake and turn signal lights are possessed.

When I step on the Expedition brakes, all of the lights come on--including the license plate light. I can do Morris Code from just about every visible angle just by stepping on the brakes.

When I use either the left or the right turn signal the same thing happens. All of the lights, including the license plate, start blinking.

I've tested with a volt meter and nothing out of the ordinary.

I sure could use help in figuring out what is going on. What to double/triple check?

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Old 02-02-2015, 09:33 PM   #2
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1969 25' Tradewind
Shasta Lake , California
Join Date: Sep 2012
Posts: 539
Take out the resistors and get a LED Flasher for the Expedition.

Grounds are real important with LED's.

The resistors may be back feeding the other lights, a diode in each may stop this.

Glen & Jane 1969 Airstream 25' Trade Wind
2014 Toyota Tundra
1998 Chevy Tahoe
2001 Casita 13' Patriot Deluxe
2004 Chevy SSR+ 4 other trailers & 6 other Cars & Trucks
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Old 02-03-2015, 06:22 AM   #3
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1979 31' Sovereign
Spring , Texas
Join Date: Jun 2014
Posts: 271
Thank you for the reply.

Is there a specific flasher diode that would work the best?

Thank you again
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