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According to Warn's website (http://warn.com/truck/winches/src/M8274-50.shtml) my 8274 can draw as much as 450 amps :eek: during a full 8000lb pull. This makes me realize that my current wiring setup may be not be up to snuff.

Currently I'm using:
2 Exide Orbital Blue-tops
Perko battery selector switch rated at 250 amps continuous, 360 amps intermittent
2 gauge Monster Cable


Per this table http://xtronics.com/reference/wire_gauge-ampacity.htm it looks like my 2 gauge is only rated to 181 amps. Also per that website, it doesn't look like even 4/0 cable would be up to the task, rated at 380 amps - although that's probable a rating for continuous duty.

Also I see Perko makes a HD dual battery switch rated for 380 amps continous, 850 amps intermittent. It's $100, do I need it?
 

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I ran 2/0 when I rebuilt mine with the 9.5xp motor and don't regret it, I remote mounted the solenoid box under the hood though so the connections between the solenoid box and the winch motor are about 3ft long.

The max current you are looking at is at full load, how long are you really at full load? If its pulling that hard its normally only for a few seconds and then it eases up. Warn ships their winches with 2 guage leads which I personally feel is inadequate but they must think it's a good compromise between price and performance. I think 2/0 is on the heavy side but I don't think its overkill.
 

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Those 6' 2GA leads at 450A will induce a 1V drop.


2/0 will be a .5V drop.

That said, my rig still runs the stock 2GA wire, I have not had a problem with it.
 
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