<https://offroadpassport.com/forums/topic/3923-quotthe-tankquot-1978-travco-320/page/2/#comment-49998>
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"Recently I discovered a Travco enthusiasts page on Facebook. I was able to ask a few questions about the charging system, and receive some answers. The solenoid does work to charge the house/engine batteries, but is actually operated by a secondary module for when it is connected to 115v. which explains the various \"thermo-breakers\" I found near the solenoid. These operate based on heat/resistance, and self-reset based on such. \n \nApparently this was Travco's unit of choice, and was used all throughout their models in the late 70's.  \nFurther investigation is required. I have been told to look under the rear driver's side bed for this unit. One kinda-sucky thing about this is that in order to activate the unit, you would have to lift the bed up to flip the switch every time you dock. Perhaps I'll look into modding gas struts into the bed \"lids\". "
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