Multimeter clip for fuel system?

["Alexander van Gerbig" <Audi_80@msn.com>]

    Today I ventured into the fuel system to checkvoltages with my
multimeter.  I made a homemade set of connectors to hook-up directly with
the Bosch fuel system clips and it works OK.  I get voltages with a postive
reading that are within the tolerances described, but when I checked it on
my ISV the engine acted as if the ISV wasn't getting any power.  Now my
question is when running a multimeter setup like this is it possible to feed
the proper voltage through the multimeter and to the component of the fuel
system as if the multimeter was a bridge?  OR when the multimeter is hooked
up will the power going to the component not get there?
    The connector is made with an oxygen sensor "pig tail" being the male
end, and a female clip I got from a mechanic.  I have the male end hooked up
to the positive test lead, then the female end is hooked in to the negative
test lead on the multimeter.  The male end is hooked into the signal coming
in from the ECU and the female end is connected to the component as if it
were the signal lead itself.  I figured that would create a circuit using
the multimeter as a bridge, right?  BUT then how does the component get a
negative ground to work properly?

Thanks!

    Alexander van Gerbig '88 80

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