Last updated on March 20th, 2010 at 12:16 pm

Your travel trailer or fifth wheel is broken down on the side of the road at night and you want to take your truck into town for parts or to get help. Wouldn’t it be nice if you could leave the trailer marker lights on? Since flashing lights mean caution or emergency it would be even better if you could make them flash.

I’ve seen instructions for an emergency flasher that requires you to purchase a female connector, do some soldering and wrap the lash up with electrical tape. Well, as you will see from the illustration below, this way is so easy that anyone can do it and all it takes is a heavy duty 2-pin flasher available at any auto parts store.

The key is to connect the flasher to your trailer’s umbilical plug as shown in the illustration. See how the plug is oriented with the square bump at the top. Notice the two white arrows pointing to the top two pins of the plug. The pin on the left is #4 and is the battery charging line. The right pin, #3, supplies power to the license, tail and running lights.

When you want the lights on but not flashing… we use our running lights as makeshift Christmas and party lights… just use a short length of 12 gauge wire as a jumper to light up your rig.

You may also want to read: Wiring the 7 Pole RV Tow Vehicle/Travel Trailer Umbilical Plug at RVbasics.com

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RV Repair and Maintenance Manual – Updated and Expanded The most popular resource for RVers who prefer to work on their own RVs. Featuring step-by-step procedures for maintaining and repairing RVs, in easy-to-understand layman’s terms and simple-to-follow instructions. Includes topics on electrical systems, LP-gas systems, water systems, sanitation systems, AC generators, heating systems, air-conditioning systems, refrigerators, trailer brakes, trailer suspensions, dinghy towing, hitches, drivetrain systems, solar power systems, ovens and ranges, microwaves and ice makers, exterior and interior care, and accessories.
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