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Conversion of 5 Wire to 4 Wire Taillight system for Towing

This forum will archives technical threads that are unique to Eagle Buses. There will be one thread for general comments, but the technical threads will be locked. The intent is to have a repository for detailed technical information that can be of prime importance to an Eagle Bus Owner. New threads can only be created by the forum administrators.

There are often threads on other bus forums that discuss this subject. Indeed there is an active thread on BCM right now.

In 2009 I experienced my upteenth failure of a commercially available converter (photo below).

After Market Converter.jpg


That prompted me to fabricate a homebrew converter made with automotive style relays. I had observed information/systems built by Craig Shepard, Sean Welch, and Jack Conrad. Ultimately I documented my conversion in an article published in Bus Conversions Magazine. I have uploaded that article on our website: http://eaglesinternational.net/category/articles

As background information, Eagles (and most buses) have turn signal lights separate from the brake lights. This results in a five wire circuit. Virtually all trailers and cars have the turn signal lights combined with the brake lights (4 wire system). As a result, a converter is required. The circuit designed with relays is much more reliable than most commercial converters. It is fairly easy to construct and the parts are fairly inexpensive. Indeed, the original Eagle relays can be used.

The article has two wiring diagrams. I have attached the diagram I made for my system.
Attachments
Trailer 5 to 4 wiring.pdf
(261.28 KiB) Downloaded 263 times
Jim Shepherd
Evergreen, CO
'85 Eagle 10 with Series 60 & Eaton AutoShift 10 speed transmission - not at all fancy, but fully functional
Bus Project pages: http://beltguy.com/Bus_Project/busproject.htm
Blog: http://beltguy.com/blog/
Email: jim@eaglesinternational.net (Please email me rather than use the PM process)
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beltguy
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I burned out several of those before I smartened up and just added another pair of lights to all my trailers.
Joe Laird
'78 05
Sioux Falls, SD
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akroyaleagle
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