Wideband Install- "(4A/T)" Circuit
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Author:  GVR-4 [ Fri Mar 12, 2021 7:15 am ]
Post subject:  Wideband Install- "(4A/T)" Circuit


Is there any load on the 10 amp circuit designated "(4A/T)" at the fuse panel? It does get power when the ignition is switched to on. I'm looking for a dedicated circuit for my wideband controller install and this may be the solution. Does anyone know if this circuit is unused since our cars are all manual transmission vehicles?



Author:  Flying Eagle [ Sun Mar 14, 2021 10:51 am ]
Post subject:  Re: Wideband Install- "(4A/T)" Circuit

Page 116 in this manual is where the 4AT electrical starts. Might find where the Ignition feeds are coming from, because if they are tapped but unused, then you may be able to use that circuitry for a power feed. I would very closely follow the grounding location recommendations from Innovate or similar companies, so you share a proper common ground with the ECU.


Click me

Author:  GVR-4 [ Sun Mar 14, 2021 12:17 pm ]
Post subject:  Re: Wideband Install- "(4A/T)" Circuit

As always, thanks for that, Tim. That looks very much like the diagram in the 1989 Mirage Service Manual that Michael DeSalvo bequeathed to me when I bought the car. I was thinking the same thing you are in tracing the circuit to make sure it can be dedicated with no other loads. And I agree too on the wideband controller grounding- thanks for reinforcing that as well.

I hope to get some time to poke around on it this evening.

Thanks again.


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