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Welcome! From Utah
Can't speak to the mystery box, but upgrading to a 6 volt system is a good idea. We upgraded our Cougar a couple of seasons ago and have been very happy with the outcome.
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2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
I think the little voices in my head have started a chat group.
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