Why is the ACC circuit shut-off during start?

[jhooten]

To prevent voltage spikes generated during the high current flow from damaging equipment connected to the acc circuit.

[DavidM]

To prevent voltage spikes generated during the high current flow from damaging equipment connected to the acc circuit.

That's something I was wondering. I was planning on wiring my gauges and Traqmate/Chasecam to the ACC circuit. With a separate switch for the ACC circuit I could leave it off until the car was started to protect that equipment. Of course, I think in the old car I had everything wired to the ON circuit so it stayed on and I didn't fry anything.

David

[jhooten]

Modern starting/charging systems are better designed and less likely to generate destructive pulses but it can still occur.