Winches and Batteries - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-09-2000, 04:19 PM
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Winches and Batteries

A guy I know is selling an older Warn M8274. He's asking $450.00. Everything works. It just has to be cleaned up. Should I buy it?

I've also decided on installing dual batteries. I really don't get the logic of isolating the batteries from each other. Why not just wire the batteries in parallel and be done with it? Quadratec has a wiring kit for $99.95. The kit comes with a relay. What's the relay for? Why not just make up my own cables?

What is Warn's "Accessory Power Interrupt Kit" and do I need one?


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post #2 of (permalink) Old 09-09-2000, 05:13 PM
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Re: Winches and Batteries

when you wire batteries in parallel if one battery is weaker than the other it will constantly be drawing off of the other. this will intern weaken the good battery. the other reason to isolate them is if you are winching and you completely wear down a battery you still have one to start your jeep.

brian wilson
80 cj5 "high 5"
stretched to 100" wb
post #3 of (permalink) Old 09-09-2000, 10:16 PM
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Re: Winches and Batteries

The other reason for isolating is also due to the inequality of charge in batteries...two batteries will never have the exact same charge and when wired directly together in parallel, they will try to equalize, but because the transfer of energy isn't 100% efficient, they end up using energy, continously, until one of them dies... The isolation of the two batteries prevents them from killing each other while the jeep is off (as well as providing you an option of preserving one battery in a high-stress situation (winching, etc) to have a backup starter battery in top condition). If you really wanna do it without a isolator, use two 6-volt batteries and wire them in series (credit goes to CJDave for that idea...) but you still won't have the redundancy involved with the dual 12v isolated batteries.

The jeep is up and work fix..the jeep work fix...the jee...damn
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