747 VSS Question

[Bruce Plecan]

Sounds like the G20 had maybe some version of ABS??.
For those they need a high resolution VSS, so yes there would be a DRAC of
some fashion.   This is all off the top, of my head seen I've never actually
seen what you have there.
bruce



> On a '88 G20 van I just ripped apart the VSS is optical and goes to the
VSS
> buffer, which is what I expected.  Saved cluster and buffer just in case
> needed.
> From the '747 diagrams posted on /incoming (specifcally 747ecm5.jpg) it
> shows a "permanant magnet generator"  hooked to the VSS buffer and then to
> the ECM.   I thought '747 trucks used optical VSS?
> Is there a different VSS Buffer for magnetic and optical?  Is there such a
> thing as a '747 truck w/ a mag. VSS?
> I looked in the archives and there's a ton of info about the later DRAC's,
> and about eliminating the pass. car VSS buffers for TBI -> '730 convert.
> I'm putting a '747 TBI on a '84 GMC pickup.     Might be able to put the
> 88' G20 van speedo guts in the '84 GMC pickup cluster if I need to, last
> resort.
> -> Bob Valentine
> -> bob at tecmark.com

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