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**[email protected]** · May 22nd 07, 06:59 AM posted to rec.aviation.owning,rec.aviation.homebuilt

In rec.aviation.owning wrote:
In rec.aviation.owning wrote:
Intermittent problem with an Aerospace Logic VA-100 Volt & Amp
indicator.
Volt side works at all times and is accurate, amp side works properly
occasionally but more often than not displays -0.0 amps. When it does
work it indicates charges and discharges properly.

I'd guess an open in one of the twisted pair wires to the shunt. With
the given wiring, it has to be reading the system voltage between one
of the twisted pair wires and ground, so both wires in the pair probably
aren't open.

I finally got Aerospace Logic's Web site to respond and the manual they
have there for the VA-100 shows that it does have a separate power wire -
it isn't powered through one of the shunt wires. What this means to you
is that either or both of the wires in the twisted pair could be open,
not just one as I said above.

Matt Roberds