I have a battery selector switch (two batteries)(offroad application), my computer is fused after the switch. Does it hurt to constantly disconnect the computer? Does the comp have to relearn everytime it is powered up after being disconnected? Thanks, Joey

 

Yes, it's always going to be relearning. This is not necessarily a bad thing unless your tune is way off.

 

Maybe a third, little dry cell or sealed lead acid as
a "backup supply" on the PCM side of the switch
would make things a little less like every-day-is-
Monday.

 

Wait a minute guys-I thought there were provisions for holding data for a short amount of time.
If not, why does everyone always say to reset the
computer "remove battery cable for x amount of time"?
It may not be relevant, but I'm pretty sure I can disconnect/reconnect my battery and still have all the
radio presets/time still intact?

 

If its just a split second between batteries it should not matter. Most pcm's will hold data for a short amount of time if the battery is disconnected, assuming you don't switch on the ignition

 

So...................I should be good to go??

 

I read it before as your were switching back and froth manually. If it's just a switch, there should be enough residual charge to keep the learned values intact. So, I would assume you are good to go. What's the purpose of this anyway?

 

It is a manual selector switch to switch from bat 1 to bat 2 to both and then off. I did this for two reasons, first I have my stereo on one battery, that way I will never have a dead starting battery. Second, I like to turn it off when I am in the desert at nite as some sort security. It has a keyed lock to lock it off. When the switch is in the off position, the entire electrical shuts down including the PCM.