After having an almost dead set of batteries two times in the past two days, I need to figure this out.

First off, I'm in a company truck. I've talked to our shop foreman about adding an isolated battery and he's fine with it. They'll even install everything for me, I just have to provide the materials.

I have a 1,500 watt inverter that's hooked to my trucks batteries (4 batteries). The inverter only runs my laptop when the truck is shut down. If I need to use the microwave, I start the truck.

The only other thing that runs constant is my cooler. It's a 12-pack sized Rubbermaid.

I noticed that if I shut off the cooler when I'm shut down, the batteries do fine the next morning.

Anyway, what I want to do is to add one or two deep cycle batteries that the truck will charge, hook the inverter and cooler directly to them. What I was thinking would be to add a battery isolator, such as this one:
http://www.jcwhitney.com/2-BATTERY-S...0926_10101.jcw

The question is, how would this be wired to the truck? It has 3 posts, which I know what they are - battery 1, battery 2 and alternator. So, how would that work in the truck?

Any ideas?

 

Sounds like you just need new batteries, have the current ones load tested.

 

That cooler shouldn't be running your batteries down like that. Allan is right replace them and you'll be fine.

 

If they will install it then the question of how the wiring goes isn't your problem exactly. :lol:

I guess I would interpret those three points on the isolator you linked to as:
1) Starting Battery(ies) positive
2) Isolated battery(ies) positive
3) Alternator positive