Maverick Posted September 26, 2017 Share Posted September 26, 2017 2015 Oliver Elite II 12 VDC “NEGATIVE” Connection Issue After replacing the battery tray and the stiff wiring going to the batteries in our 2015 Oliver Elite II trailer; I checked out the trailer electrical system. I discover that the trailers on board battery negative was never bonded to the negative coming from the tow vehicle. Because the two negatives were never connected together it created two problems. First the tow vehicle would never charge the trailers on board batteries. Second the trailer brakes negative lead was connected to the trailers on board battery negative buss bar. Second the trailer brakes were obtaining the negative connection only through the trailer ball when connected to the tow vehicle. The tow vehicle’s negative lead was only connected to the exterior lights on the trailer (marker lights, turn signals and back up lights). Up until the past two months our trips have been a max of a day or two travels. During July and August we travel throughout the west, after the first couple of weeks I started logging the start of the days battery voltage and then logging the end of the travel days battery voltage and all of the time it was about ½ a volt lower at the end of the day (we don’t have solar); for all of the other travel trailers we have owned the tow vehicle would keep the trailers on board batteries charged. I have bonded the two negative systems together, which has corrected both issues. I located several pictures of wiring diagrams that Robert Partee – Oliver TT Sales Manager at the time we purchased our trailer gave us. The pictures were so bad you could not read anything. After blowing up the pictures, there was one of the tow vehicle cable and how it routed throughout the trailer and it did not show any connection between the two 12 VDC negative systems. Also it did show that the brakes negative lead was connected to the trailers on board battery negative buss bar; as I described above. I have discussed this issue with Richie Carroll at Oliver Travel Trailers. There is a simple test you can perform to see if your trailers tow vehicle 12 VDC negative lead is connected to the trailers on board battery negative buss. Using a multiple meter at the tongue of your trailer and the cable that connects to your tow vehicle; connect one lead from the multiple meter to a metal point on the trailer and the other multiple meter lead on the ground terminal of the trailer cable. If the two systems are connected together you will read a shorted connection; if not your meter will show an open connection. If you obtain an open connection, I suggest you correct the issue. 6 Horace & Dianne Chesapeake, Virginia 2016 Toyota Tundra Crewmax 4x4 Limited 2015 Oliver Legacy Elite II - Hull # 93 Link to comment Share on other sites More sharing options...
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