747 VSS Question

[rr]

This one has six wires. I've seen the same box with less. It
came out of a full size Chevy?/GM? van.

A blk
C lt blu
D blk/wht
F blk/org
G org/blk
H blu/blk

Has a flip-top lid where the pcb can be pulled out.

By your description, it doesn't sound like the magnetic
buffer would be an easy retro-fit to another vehicle.

BobR.

Shannen Durphey wrote:

> rr wrote:
> >
> > The optical buffers I've seen are lime-green in color. They have
> > a three wire cable to the optical head. The edge card conn has
> > two sets of outputs, one for the ecm, the other for cruise.
> >
> > Recently I grabbed a '747 out of a van that had a small black
> > box attached to the ecm mount. At first I thought it was a drac.
> > However, no jumpers and not too much inside. Now I'm thinking
> > it was maybe a magnetic buffer. Next time I run into one at the
> > yard, I'll check more closely for the pickup. An inline mag unit
> > that goes to this buffer would be handy.
>
> The DRAC is a magnetic buffer.  The magnetic sensor is part of the
> transmission.  The reluctor ring replaces the speedometer cable driving
> gear, the sensor sits where the speedo cable driven gear and sleeve
> would be.  Theo utside  diameter of the sensor is much larger than most
> speedo gear sleeves.
> Vans and pickups with Rear Wheel Anti Lock systems usually have an RWAL
> controller near the master cylinder.
>
> My memory's failing : (  What color and roughly how many wires were
> attached to the small black box you found?
> Shannen
>
> >
> > And yes, I've kinda' wondered about that magnet generator
> > shown on the prints.
> >
> > BobR.
> >
> >
> ----------------------------------------------------------------------------

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