Radio and A/C off when turning off the FiST?

[GreenenvyFiST]

I just recently put a new battery in, and I have always just turned the car off with A/C and radio on. Does it make a difference one way or the other? Thanks.

 

[The Cuzi]

I just recently put a new battery in, and I have always just turned the car off with A/C and radio on. Does it make a difference one way or the other? Thanks.

I don't believe it does. Is there anything you're trying to gain or avoid by turning them off prior to engine shutdown?

 

[Capri to ST]

The only difference I could see is that if they're on when you cut the car off, they will presumably be on when you start it, and there might be some very small extra load on the battery from that when starting.

 

[GreenenvyFiST]

I don't believe it does. Is there anything you're trying to gain or avoid by turning them off prior to engine shutdown?

Just battery drain.

 

[TyphoonFiST]

Just battery drain.

Get an AGM battery!

 

[D1JL]

Just battery drain.

It makes no difference at all if you leave the radio or AC on or not.
Once the car is turned off the countdown timer starts, after that time, all circuits are shut off to prevent battery drain, like if you left the lights on.
There is of course one exception and that is the keep alive circuits.
These are the clock, external door locks, and remote receiver, I am sure you can understand why.

 

[M-Sport fan]

I believe Greenenvy was asking about the added strain on the battery/charging system during the next startup if these are left on for the ignition off shut down, and not that they would keep running and drawing current after the shut down itself, but I could be wrong about that.

Greenenvy??

I personally turn everything off, the rationale being, why chance/bother straining/weakening an even new and strong (AGM which I have or not) battery on start up by leaving this stuff on?

 

[The Cuzi]

Just battery drain.

I don’t believe leaving both on would make a noticeable difference even after hundreds of cycles. If you’ve played mad scientist with the fuse panel or have an issue it could but that goes without saying.

 

[Scotman2]

I always have the radio and A/C off before shut down. That little glowing lamp indicates that the a/c clutches are energized. The clutches are electro magnetic. When energized they not only use power, they add cranking resistance by engagement of the compressor, which equals wear and tear. So, it's detrimental in two ways.
The former flat rate mechanic in me recommends that (if you have extra disposable income) you always have all lights and accessories turned on full tilt when cranking the engine! There are many mechanics out there with child support payments and other revenue sucking costs to deal with.