Battery isolator question for winch hook up.

[LandfillLumber]

First off thank to all those that replied to my other winch post.I was wondering if this is what i need to hook up the second(winch) battery so that I can charge while driving.Also I was told that  a small wire could be used like a travel trailer kook up to feed back to the second battery(for charging only not pulling the load).Thank you,Victor
http://www.rvwholesalers.com/catalog/battery-switch-19-0349.html

[sprucebunny]

That's a solenoid. You will need a small switch to turn it off and on.

How do you plan to monitor the condition of your accessory battery ? Do you have an electrical tester that shows voltage ?

The longer the run of a wire, the heavier it needs to be. I'd recomend a 10 guage wire to charge only. It must be disconnected or the solenoid OFF when you use the winch.

[Magicman]

I was told that  a small wire could be used like a travel trailer kook up to feed back to the second battery(for charging only not pulling the load). 

Wrong.  The wire needs to be large enough to carry the charging load.  Charging at a 30 amp rate takes larger wire than charging at a 20 amp rate.  Look at the leads on a battery charger.  The larger amp chargers will have larger charging leads.  I'm not going into "Ohm's Law" but if you really expect to charge your battery, you will use a #8 minimum.  I would go much larger than that.

With a travel trailer hookup, you will easily travel many hours and sometimes all day.  Plus, the battery usually has not been heavily drained.  That does not describe your usage.

[LandfillLumber]

I have some #6 multi strand left over from a job that is what I was hoping  I could use???Is this more what i need for a isolator?http://www.ase-supply.com/Sure_Power_702_Battery_Isolator_p/sp-702.htm
OR
http://www.awdirect.com/battery-isolators-160-amp-sure-power-industries-inc-12023a/battery-protection/?CID=AWSEFGL&EPC=AWSEFGL
Thanks guys for helping a dummy,Victor

[Magicman]

Yes, use the #6 wire.  Personally, I would not use an electronic isolator.  I would use an RV type solenoid like this:

http://www.americanrvcompany.com/Tow-Ready-118665-Battery-Isolation-Solenoid-3-Pole-12-Volt-Chassis-Ground-Camper-Trailer-RV_p_2543.html

If you have an RV store locally, they should have one.  These solenoids look like starter solenoids, but are rated for continuous duty.  I have no idea of the amperage capability of the above example.

I would also have something like a 25 amp or higher fuse at the battery/alternator.