Help from the Electrical Guru's (small project need to ask some questions on)

Hi All, excuse the newbyness of this question, however I was wondering if some of you might be able to help.

at the moment I have a remote controller that controls a valve in my car exhaust but due to the crappy design of the remote the battery inside keeps coming loose.

what I was thinking of doing was to make a hard wire switch using the chip board inside the remote and hooking it up to a 12V source inside my car (ie. car stereo power cable) - refer picture.

Basically the valve i nthe exhaust has 3 modes, open full - half open and closed. what type of switch would be appropriate to use and how would it work into the diagram i've drawn up?

does what I've drawn A: make sense & B: seem feasible?

Any help appreciated
Ben

instead of battery use cars 12V and a regulator to power the remote....the rest wont change.

what is the voltage on the remote. I know some work on 12 vdc.

Ill have to check the voltage of the remote. - ok, the battery for the remote reads 27A 12V and labelled as a "High Voltage Alkaline Battery"

but basically my little picture above works?

or would i need to try something like this? (taking into account, i'm doing away with the remote) *just using the chip board*