I hooked the power wire upto my AMP in the trunk. I didn't want to run a whole new wire to the battery. So I combined it where the power wire for the amp is. Is that bad? I don't feeling like blowing up the amp or popping fuses. Has anyone else hooked up their heater like this? TIA

 

What size power wire do you have running from the battery to the hatch area?

If you're running #8 or thicker for your amp, the bottle heater will be fine. But if you've got a very strong amp, you'll probably want to turn off the stereo when you use the bottle heater.

 

I do that all the time in installs, just make sure the system has a a large enough power wire for both to be on.

I always install systems with overkill, so that is not a problem for the installs i do.

Ryan.