View Full Version : Wiring of Winch

17-01-2008, 02:08 PM
I have read several posts on the installation of winches and they are very informative. One question I have is how do you wire them to the battery. Main or Aux battery. I have heard a few suggestions and it seems preferable to wire to the main battery.

Does anyone use any special gismo on the battery terminal to attach all the cables? It's starting to get a bit crowded.

Thanks for any suggestions.


17-01-2008, 08:55 PM
Hi GeoffO

I initially installed the winch wiring to the main battery, which was ok but I have just finished the dual battery install and have transferred all of the auxillary wiring across to the second battery because of the current it would all be drawing. I went with an extreme high cranking battery for the dual set up as I run a deep cycle in the trailer and figured that I might need the cranking amps in a sticky situation where the vehicle may not start.

It is interesting though as I put Century batteries in the vehicle and the trailer that the pricing from Battery world for the deep cycle was $226 and I picked up the same brand, warranty and capacity for $169 from Goodyear and the vehicle battery was quoted $220 from Battery World and purchased from Goodyear for $149. Even Super cheap couldn't get anywhere near the prices even with 20% off sale they were running.

17-01-2008, 09:51 PM

Whether you wire to the cranking or Aux. battery is a function of what type of Aux. battery you have. Using anything other than a cranking battery to power a winch with decrease the life of the battery. How much it effects battery life depends on how often you use the winch and to what state of discharge you take the battery. But heavy winching of a non cranking battery can dramatically reduce the life of the battery.

So if the the Aux. is a cranking battery then run the winch from that. If not, run the winch off the main battery.
Note that some dual batery controllers will allow you to short the two batteries togther via a switch. If you have a winch it is a good idea to have this feature installed as it gives to the abiltiy to start off the second battery, should you flatten the main battery winching or winch off both batteries if you are really stuck. This of course means you must have suitably sized cable installed between the batteries.


17-01-2008, 10:21 PM
G'day Geoff

I've got my winch running off the Aux battery.

Both batteries, in the car, are identical cranking batteries separated by a Redarc isolator. I've also got an emergency start switch in the car to trip the isolator and link both batteries .. but I've never had to use it for winching.

The Redarc isolator also has instructions for wiring in a relay, activated by your winch controller, that trips the isolator and links both batteries automatically when winching. Just another one of those things I haven't got around to doing yet.