I had this problem on my 2015 Tuscany. I junked the failed Trombetta and installed a White Rodgers 15V coil relay (586-108111.) Worked great in the 2 years since installing. Yesterday I started up the ISL9 to see if the both the coach and chassie batteries were charging. After about a 3-5 minute delay the relay closed. With my clamp on amp meter I measured 55+ amps of charge at engine idle going to the slightly depleted coach batteries. Soon the current tapered off to a lower value as the batteries charged. I'm a happy camper! Now if I can just get my Aqua Hot working? I have an appointment with a factory guy next Tuesday for that.
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