ak2handr Posted January 23 Share Posted January 23 Hiya, all. The chassis battery master is somewhat mechanically sloppy; it can turn from 90° (on) CCW past 0° (off) to about 300°. As I'm having chassis-side electrical issues, (covered in separate post) and I've read that the stock switches are kinda cheesy, I was going to replace at least this switch, and probably the house side as well. I've read references in this forum to Blue Seas Systems switches and have found a couple of vendors. Question: which model have folks here been using? There are switches rated for 300A, 450A, and 600A. The largest rating shows a 30-second crank spec of about 1,760A. My engine is a Cummins 300 ISB, and I don't know how much current the starter should typically demand. . From the 300A version to the 600A is only about $60 difference -- each. I don't mind purchasing the higher-rated unit, but if this engine & related chassis circuits will never draw anywhere near 900A short-term loads, nor over around 300A, I could use those $60 for two or three gallons of diesel ..... So which version do y'all folks (they talk like that here) recommend? Related battery issue follows in separate post. Many thanks & 73, Barney KL7HNY/4 Link to comment Share on other sites More sharing options...
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