[Diy_efi] Re: check VSS

[Robert W Hughes]

> How do I check a junkyard GM VSS to see if it's okay?  Can I go it 
> with a voltmeter?
> 
> I have a pair of them from mid '80s S-10 pickups, and I'd like to
> know if they work before crawling under the truck.
If these are the type that mount in the speedometer hole on the
tailshaft of the transmission and have a gear like a speedometer cable 
on the shaft, just connect them to a pointer type meter
set to measure 10-20volts DC. Spin the gear by hand and the meter should
whip back and forth positive and negative. This type is a permanent 
magnet generator producing about 10-12volts peak to peak.

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