Likely not connected to the chassis batt.
Yes, they are a boat anchor. Get a Progressive Dynamics if you have RV/marine deep cycle batts, an Iota if you have golf-carts. Each has appropriate bulk charging volts for their particular battery type. And no, they don't tell you that - you have to read in the specs if you know what you're looking for.
End of story. And yes, the old parallax lump will cook your batts.
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Chris Brown -
2005 Itasca Sunrise 31W - W20 and 8.1
2021 Chevy Spark Toad
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