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Trunk batteries are good, only if you have a thick ground wire such as a 4 guage, and make sure that the contact point of the body is paint, and rust free.
Normal voltage with engine running should be around 14 volts.
If you have 13 volts, it probably means your alternator is not charging. I would change that, or at least do a voltage drop test.
A ghetto way of testing to see if you have a short is to turn off all your accessories, alarm, radio, closed the door, basically turn off everything that you can, and turn the car completely off with the key out, and take your positive terminal out and slightly touch the terminal to the battery, if it sparks a little, that means you might have a short, which could be one of your problems.
Tung
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