KiloWhiskey1
Well Known Member
Asking for a friend. He has a dual alternator system with a JPI EDM 930 engine monitor. His A&P wired the backup alternator through the same ammeter shunt as the main alternator. The amp readings on the engine monitor are erratic and in the -100 amp range. Doing some troubleshooting, we disconnected the backup alternator and the engine monitor reads the correct amp draw.
So my questions are:
1. Is there a way to use only one ammeter shunt when using dual alternators?
2. If we added a second ammeter shunt for the backup alternator, how should we wire the engine monitor? In the current setup the JPI only has two ammeter wires, one for the positive and one for the negative side of the ammeter shunt.
Thanks for the help.
Keith
So my questions are:
1. Is there a way to use only one ammeter shunt when using dual alternators?
2. If we added a second ammeter shunt for the backup alternator, how should we wire the engine monitor? In the current setup the JPI only has two ammeter wires, one for the positive and one for the negative side of the ammeter shunt.
Thanks for the help.
Keith
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