ammeter shunt causing havoc in FlightDek 180

[Coling955]

I've installed the Dynon ammeter shunt in position A in the manual. When I connected up the high and low amps leads to the shunt all sensors that use a 5v excitation - manifold pressure and fuel pressure - suddenly started giving wayward readings. When I disconnected the wires to the shunts everything returned to normal. Anybody got any ideas? The rest of the 180 is working according to plan.

 

[dynonsupport]

If one of the amps shunt wires went to the wrong pin, you would see this behavior. The shunt wires are supposed to be pins 24/25, but 12V on pins 23,26, 4,7, or 8 would all cause this. Are MAP and Oil Temp OK when the amps is disconnected? If not, those pins are OK and that reduces the possibilities.