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So...I tried switching the red and orange wires on the DUVAC. No change. I also attempted to see if the alternator(if fed 12v directly to the field and outputting directly to the front battery..i.e. bypass the reg and duvac) would supply 14v. Even with alternator adjusted to the LOW setting...

Thanks man....says right there only needed if your charging two batteries with one alternator.

The jist of it was.... i appreciate your info very much. I was studying the Sure Power patents today to try to understand design intent...I too understood that it seems the alternator was capable of the dual voltage(12v or 24v) based on the field value. So why not just wire the top alternator...

I posted something 40 minutes ago and it said it will show up after being approved..not sure why.

CUCVFAN, before I got your informations(thanks so much) I was reading patents(for the sure fire relay(the smaller blue box)) today to understand the design intent. I too initially thought the DUVAC was doing something to only allowing 12V output from 24V input. After studying the Sure Fire...

CUCVFAN...I was trying to find that...all the old links from the diesel forum were dead. Gimpy, I'll take a look.

Do u have pics of the labels...specifically the DUVAC. The relay has a label with corresponding patent numbers and from this I can determine true design intent. I have the relay part number and label images. Just need the DUVAC itself. Thanks.

I appreciate the offer. I'll let ya know.

Before you say anything...I know and have done the research on the DUVAC elimination. Not what I want to hear in this thread. This is a science and electronic thread. Does anyone have a extra DUVAC lying around they could take the cover off and show me the guts? Mine's still on the...