Any reason to not run a 200 AMP alternator?

[Cubey]

The thing about IDIs, they don't need very much power once running. The only thing keeping the engine running is the fuel cutoff valve being open with power feeding a solenoid.

If you have a C6 or stick, the transmission uses no electricity at all. E4OD uses some, but probably not a ton.

The biggest draw when driving would be the headlights, if turned on. If you have an electric fuel pump, you can add that to the list.

So, a 120A alternator is pretty generous for an IDI already.

 

[MtnHaul]

The thing about IDIs, they don't need very much power once running. The only thing keeping the engine running is the fuel cutoff valve being open with power feeding a solenoid.

If you have a C6 or stick, the transmission uses no electricity at all. E4OD uses some, but probably not a ton.

The biggest draw when driving would be the headlights, if turned on. If you have an electric fuel pump, you can add that to the list.

So, a 120A alternator is pretty generous for an IDI already.

Well I can't say how many amps were being drawn but at idle with the defrost and floor vents on high, stereo, headlights/running lights, and minimal E4OD electronics were quickly drawing the battery down below 12.5 volts with a nearly new 1g alt installed by the PO.