Originally Posted by fireshadow
sorry for bringing a dead thread back to life but I was wondering something, I would like to run dual batteries on my yj and don't think I need dual starting batteries since it doesn't get that cold around me, but I do plan on hooking up off road lights for fishing and running my winch when needed. I was thing a starting battery and a deep cycle for the lights and winch. I was really intrigued by this set up but wanted to see what you guys thought would be the best set up for me. Also still have stock alt. I am willing to upgrade if it is called for. This is my first dual battery set up, thanks.
Long dead post, but relevant...
The dual batteries *MIGHT* not be needed for starting the engine,
They make GREAT self rescue alternative if you isolate one of the batteries when the ignition is 'Off'...
You can only run ONE of the batteries down that way, and the other will save your butt when you do leave something turned on you shouldn't have...
Also, you won't believe how much better your starter works with that second battery, and how fast your engine snaps to life since you finally have enough current for both the starter & ignition in excess...
Second batteries are SELF RESCU
They are WINCH TIME DURATION DOUBLER,
They make your starter last MUCH longer,
They help your engine jump to life when you hit the key switch,
And if you wire correctly, they are 'Lend Power' to someone on the trail,
Camp power away from the Jeep (like air mattress in your tent),
You can do simple MIG or Stick welding off them,
And they generally make things more pleasant when you don't want to get stranded.
I used to carry a second alternator for welding and emergency charging.
Having that second alternator in a CJ takes up a LOT of room and was cumbersome to use at the very least...
Now with two batteries, I can pack the alternator full of mud on the first hole in the trail and still run all day on battery power,
No second alternator needed.
In 30 seconds, I can set up to weld off the batteries with a wiring adapter and jumper cables.
I can pull a battery, drop the jumper cables and 'Lend Power' to anyone on the trail,
Or leave power back at the camp site for the battery powered appliances.
AND! I NEVER GET STUCK FOR BATTERY POWER,
The winch works MUCH better with two batteries,
The starter works MUCH better with two batteries,
The ignition works MUCH better with two batteries,
I'm NEVER stranded with a 'Dead' battery since the system isolates the second battery when the oil pressure drops (Engine shuts off) so if I leave lights, radios, ect. on, I don't kill BOTH batteries.
Since they are hard wired, one battery can be COMPLETELY dead an the vehicle will still fire up,
You can't transfer enough current with most jumper cables to do that,
You can 'BOOST' a battery that's not too far gone, but you can power the 'Dead' vehicle up from 'Scratch'...
And I don't waste any cargo room since the battery stores under the hood with NO ISSUES WHAT SO EVER...
The system is all automatic, even self rescue is the flip of a switch or the push of a button...
I can take the 'Lend Power' battery out in about 10 Seconds,
And I can be ready to weld in 30 seconds...
It's all about what YOU want your electrical system to do,
Work for you in ways you hadn't thought about before,
Or stay 'Stock'...
Doesn't matter to me either way, but I like having my system do some work other than marginally turning over the starter once in a while...