Quick "Thanks" to you for recommended the Battery Tenders. My truck
sits in the garage 29 out of 30 days per month. I purchased two of the
Battery Tender Plus' for my Ram (one for each battery). I could have
used one with a patch cable, but once I calculated the cost of the patch
cable and extra eye-let connectors, it was only $20.00 more to get a
I hooked the eye-let connectors to each battery. I also bought the 12'
extensions and zip tied them where the two plugs are next to the block
heater plug. Hooked them up and they work great. Solid green LEDs ...
I called Deltran, (Batter Tender maker), (www.batterytender.com) and
they suggested that I purchase from www.batterymart.com.
I thought this was odd, but it worked out just fine and it was cheaper
than buying direct.
Two 12v Battery Tender Plus' and two 12' extensions. $124.00 including
There's a few of them in the Jeep ng. Nothing I can't handle. :-)
But there are also some really knowledgeable folks there. Mike Romain,
for example. However, he doesn't work on Liberty's or diesels apparently.
Still, I like the folks here much better ... with a few OBVIOUS exceptions.
Two ... units (one for each battery)? Because once I calculated the
cost of the patch cable and the extra set of eye-lets it would take to
hook up to one unit, an additional unit was only $20 more. The guy I
talked to at Deltran said *some* people have success charging two
batteries with one unit without overloading it. With my luck ... I
wouldn't fall into the *some* category.
Okay... but you're aware that there's this big, heavy, red cable running
from one battery to the other, right? :)
It's not like the extra ampacity makes the battery tender work harder...
it's a fixed current output regardless of the size of the battery - bigger
batteries would just take longer to charge. The specs on the Battery Tender
- Charge/Maintain up to 4 batteries (of similar type - in parrallel)
Strange they would tell you different - though they did wind up selling two
units instead of one :)
Um ... no. I was under the impression that they were completely
separate. One battery being responsible for the glow plug/grate
thing-o-ma-jig and the other battery for starting and accessories.
<this is where you tell me that I was mistaken>
I read that too. When I called, I was originally asking about the
Battery Tender Jr. They said that it would NOT work at all and
suggested the Battery Tender Plus. At which point I asked them, "Hey, I
only need one of those, right?" And that's when they mentioned that it
*could* overload depending on the battery size. After computing the
price of the cable and eye-lets and the *possibility* of overloading one
unit, I decided to spring for the extra unit.
Yep - this is where I tell you that you're mistaken :)
Both batteries are connected together, which is why when one of my stockers
exploded, I was able to run for a couple of days on a single battery.
Look inside the big wire loom running across the top of your radiator. It's
a heavy red wire. Now trace it out. You'll see it goes from the
passenger-side battery positive terminal to the driver's side positive
terminal. True, the grid heater relays connect to the passenger-side
battery, and the starter and IPM connect to the driver's side, but since
both batteries are tied together (with that big red cable), every electrical
load draws from both batteries. They're simply routed to their respective
batteries as a matter of wiring convenience.
So here's the million dollar question: Am I currently frying something
by having two Battery Tenders connected?
And another million dollar question. If I were to unplug one of the
Battery Tenders as I currently have them configured, the remaining
Battery Tender would charge both batteries with no other cables or
If so, I can use the spare Battery Tender for my boat battery.
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