Battery vs Stereo

[Gunzz]

Hello all. I have a question to you guys who have aftermarket stereos installed in your H2's.

I have a 05 H2 and just had an Alpine W200 head unit with separate Nav unit, Sirius satellite box all hooked up to the factory Bose system, and On Star with a PAC unit. It is also tied into a rear seat headrest DVD system which came from the dealer. I also have a Viper alarm system installed.

After the install of the stereo system I have noticed that the voltmeter on the truck seems to go higher then what it used to after sitting over night. I figured that was OK since there is more power being drawn for memory to the equipment, and after asking the installing dealer he stated it was normal. However after the truck has sat over 24 hours one day I noticed it was slower to start. Seemed to turn over much slower than before and the lights came on at the same time and seemed to dim pretty low. It was sitting with the alarm activated for the entire time but no equipment or lights on.

So here is my question. Is this normal or do you think something is drawing power that shouldn't be? I know there is the engine computer, and body control module drawing power for the memory along with the alarm system and stereo memory, but I wouldn't think it would draw that heavily on a battery in a little over a day.

What do you guys think? Is there a way to test power being drawn from the battery with a volt/amp meter and if so how? Just to let you know all systems do seem to shut down and off properly when the vehicle is off so it maybe something else drawing on the battery.