ISV voltage question... John Speake please take a peek :)

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10-22-2008, 12:27 AM

#46

worf928

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Quote:

Originally Posted by Alan

... but on the diagrams the ISV looks like the extra pin on the unit exits - see the 87 diagrams for the most obvious indication (pin numbers) - later diagrams show the internals but no Pin ID.

That's just plan weird. That 'third pin' appears on every diagram from '87 through to '94. There is no external third pin on the ISV though. None.

It's got a be a wiring diagram brain fart. There are plenty of those.

Quote:

On 85/86 models all 3 pins are wired & both grounding IPs are driven from the LH.

The S3 ISVs 'rest' at 50% open with ground on one pin closing from 50 and ground on the other opening towards WFO. For S4s the rest state is open just a bit with ground driving to WFO. I have to wonder why the change was done. Ran out of wires on the S4 so they had to redesign the ISV?

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