Hey y'all, I've been wanting to put an additional battery in my 2005 because I'm running my 4 kc off road lights, winch, train horn and cb all off my original battery. My first question is if any of y'all have added one in the 4.6, where did you put it? Secondly, did you have to install a bigger alternator? Anything helps. Thanks.

 

Larger alternator will be a good idea as it reduces the stress on the alternator. You will also want a isolator between the two batteries, if you don't the batteries can have different voltage levels and cause one to drain the other over night. If you need more info on the wiring let me know.