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It takes a whole lot more than the battery, Charles. Depending on how you plan to do it, you will need a relay that parallels the two batteries for charging, and cabling, etc.
But, if you decide to do it we will walk you through it.
Yes, via the web. Reviews, tests, etc. What I've found is that there appear to be two levels of pricing: the high end, which is where Warn and Ramsey are, and the low end, which is where Suoerwinch, Smittybilt, HF, etc are. And within those levels there is a lot of commonality, albeit with some usually-minor differences. And it was very confusing.
So, we went into 4 Wheel Parts on Mingo just south of 71st St. They carry Warn and Smittybilt, which are two of the big ones from the two pricing levels. That simplified things. And when the salesman said he wheels most weekends and uses his Smittybilt frequently and without problems, that got my attention. I pressed him on why the Warn is twice the price and he couldn't explain it. Said they sell 10 Smittybilts to 1 Warn, and people seem to love them.
They are having a sale tomorrow, so we are coming down to pick up a winch and maybe a battery as they also sell the Odyssey Extreme. With the sale it looks like their price will beat that of Amazon, and I'll have someone local for support.
It takes a whole lot more than the battery, Charles. Depending on how you plan to do it, you will need a relay that parallels the two batteries for charging, and cabling, etc.
But, if you decide to do it we will walk you through it.
Not necessarily....it depends on how you are going to use it. Diesels use dual batteries with a single positive cable connecting to both batteries. I've seen a lot of snow plow trucks connecting them the same way. Unless you're running a camper type setup where you want to isolate the batteries so you don't draw power from the starting battery I don't think its necessary to split them with a relay.
I don't know about the cheaper Warn winches, but I do remember reading that their flagship 8274 model is assembled by hand which explains the $1,900 price tag. But IMO they are a bullet proof design. They've been in continuous production for 40 years and have earned a very trusted reputation. On the other end of the spectrum though...I know several guys in my off-road club that use the $300 Harbor Freight winches and haven't had any trouble with them either.
I have my positive cables running to a Cole-Hersee switch (A or A+B) so both are charged at the same time when in A+B position, or I can disconnect from the aux battery (B). From the CH switch the output stud is connected to the bat terminal of the fender-mounted starter solenoid. This setup has worked well over the years.
The original thought was, I would disconnect the main battery when camping or such, and then I could draw from (run down) the Aux battery with out concern of not being able restart the truck days later.
Yes, it does depend on how you are going to use it. But if you aren't going to have some serious accessory, like a winch or a camper, then why have the second battery? You can easily get more CCA than you'll need for just the truck's normal load in a single battery.
But, with the serious accessory you need a way to make sure that you can still get the truck started if you run the aux battery flat. Or, run the engine while running the accessory - but make sure you stop short of killing the engine due to lack of ignition.
Big Blue has the stock aux battery wiring, which means a relay is pulled in to parallel the batteries any time the key is on. So, if the load is a camper then you can drain the aux battery and still have the main battery to crank the engine. However, if the aux battery is flat there's going to be a lot of current wanting to flow between the two batteries when the key is turned on. And, that is going to try to equalize the batteries, which means neither have their full charge.
I'm thinking the system I put on the boat is a better solution. It is a Cole-Hersee smart isolator system that parallels the batteries only when the primary battery gets to 13.2v and stays there for 2 minutes. And, it will disconnect the batteries if the primary gets down to 12.7v. So, if winching with the engine running you'd have both batteries in play unless the primary got down to 12.7v. And if you ran the aux flat with the engine off it wouldn't parallel the two batteries until the primary was up to 13.2 for two minutes.
I love that setup on the boat. We had it out today and I played the sound system, complete with a 12" Kicker sub and two separate amps, for quite a while with the engine off. But, I have the sound system hooked to battery 2 and crank the engine with battery 1, although I can change that with the 1/2/1+2 switch, so I have no fear of killing the battery and not getting the engine started.
I'm thinking the system I put on the boat is a better solution. It is a Cole-Hersee smart isolator system that parallels the batteries only when the primary battery gets to 13.2v and stays there for 2 minutes. And, it will disconnect the batteries if the primary gets down to 12.7v. So, if winching with the engine running you'd have both batteries in play unless the primary got down to 12.7v. And if you ran the aux flat with the engine off it wouldn't parallel the two batteries until the primary was up to 13.2 for two minutes.
That definitely sounds like an ideal solution. My winch is much happier pulling from two batteries simultaneously. When I first bought it I had it mounted on my mud bogger for a short time. That truck uses a single group 34 battery. I only used it a few times on that truck and it just didn't seem to pull very well and it ran the battery down in no time. Now its on my '92 diesel with two group 65 batteries. Night and day difference...absolutely no comparison in pulling power. I've used it quite a few times both with the engine idling and off and I haven't managed to kill the batteries to the point where it wouldn't start yet.
I think that's the plan - the Cole-Hersee isolator with a 3G alternator. But, I think I'll do it in stages, with the isolator first while running the 1G and existing cabling, and then the 3G upgrade with new cables.
Here are some further details about the plan. First, there is an upgrade to the Cole-Hersee battery isolator that I made on the boat and may do on the truck. I like to put the little HF battery tenders on the batteries for the winter, and I use two of them so each battery can seek its own level. But I discovered that the battery isolator parallels the batteries as the chargers bring the batteries above 13.7v, which defeats the separate chargers plan. Plus, the pull-in current of the battery isolator's relay is almost as much as the HF charger puts out. And, it runs the solenoid all winter, needlessly.
So, I used a relay triggered by the ignition switch to provide the ground to the battery isolator. That way it won't parallel the batteries unless the engine is running. And, since Ford provided a similar wire from the ignition switch right to the aux battery relay on these trucks I'll probably do the same thing on Big Blue. But, in this case I'll probably use another fuel pump relay, housed in the holder Bill Vose sent me, which will mean I'll have another spare relay, just in case.
However, in thinking about it I realized that the CH battery isolator will disconnect the aux battery from the alternator when it and the main battery, since they'll be paralleled at that point, are down to 12.7v. Since the batteries will drop to 12.7v quite quickly when winching, the aux/winch battery will not be charged while the winch is being used, and yet the alternator will be spinning but not throwing much current as the main battery will be charged fully. The solution to that is the Optional Start Assist function described in the above link. That is designed to be a momentary switch that will pull the relay in at the operator's command in order to parallel the batteries for starting. But, if I put a toggle switch in the relay could be pulled in to parallel the batteries while winching, but then shut off when the voltage starts getting a bit low. And, I could use the Emissions warning light to provide an indication that the batteries are paralleled, obviously creating a new label. In addition, I could tie it into the warning buzzer on the truck so my offspring know they aren't supposed to run that way.
Which brings up the question of how one knows when the voltage is getting low on the batteries. Since I have the aftermarket voltmeter I'll know the voltage on both batteries when they are paralleled. But, what about when they aren't? Well, why not convert the ammeter to a volt meter and have it monitor the main battery, and use the aftermarket one for the aux battery.