Explain auxilary battery purpose to me
 

So I have a C30 ex motor home that has the auxiliary battery. Can you explain how its wired into the system and what exactly is the use. When you use the electrically powered devices in a motor home my guess is they feed off the extra battery some how. Thanks for any insights on how this system works.

Re: Explain auxilary battery purpose to me
 

Im interested in this one .

Re: Explain auxilary battery purpose to me
 

CG
My Grandpa's truck which is long gone was wired like that.
It was a 71 Custom camper/20.
He had a in the bed camper the we would load in the bed and go to Gatlinburg TN
Here is the 2 pics I have of the truck.
Attachment 1869452

Attachment 1869453
The two 12 volt battery's are wired parallel which keeps the system running on 12 volts and are wired so the Alternator will charge both battery's.
The one battery is isolated so that only power is drain from it to use the lights or whatever else in the camper part of the truck.

Re: Explain auxilary battery purpose to me
 

Simply put.

The main battery which I call the normal battery is for cranking the truck and running the normal stuff in a regular truck.

The second battery runs all the camper electrical stuff normally.

Now if you have it hooked up like it's suppose to be you can charge them both while the motor is running are if you need to you can use either one to crank the truck are vise versa.:chevy:

Re: Explain auxilary battery purpose to me
 

What they said. Here's some additional info:

Re: Explain auxilary battery purpose to me
 

Great post Jocko....very interesting and helpful!
I've always like the idea of having the secondary battery system...even in my 1/2 ton, which I use to pull a small travel trailer from time to time.
Not that I have a dual battery set up....but I'd like one.
In the meantime, I've mounted a second battery in the trailer and isolated it...but it doesn't get charged during driving...at least not yet.

all good
Coley

Re: Explain auxilary battery purpose to me
 

Since I don't have one, but based on the information above, the auxiliary battery would be a deep drain version. They aren't good for use as a starter battery for an engine, at least more than a few times. I have a pair of deep drain batteries on my travel trailer. They are switched from under the hood so that while dry camping the trailer doesn't discharge the truck battery, but the trailer batteries can be charged while driving the truck. So, if the trailer batteries go dead from over use, the truck battery will start the truck so that we can leave the campground...if we were even in a campground. Sometimes we camp out in the middle of nowhere. I have a portable generator as a backup, in case I forget to flip that switch...

Re: Explain auxilary battery purpose to me
 

Good info. I knew they charged together but was unsure how if they charged together how come they didn’t discharge together.

Re: Explain auxilary battery purpose to me
 

The key to this system is a battery "isolator" for directing what is hooked up to what while charging or drawing on the system.

Re: Explain auxilary battery purpose to me
 

Great info. I want to find a second tray to hold another battery for my 12000 winch. Pull the trees out to the build site. And pull the truck out when I get it stuck

Re: Explain auxilary battery purpose to me
 

Does anyone have any pics and references to these factory GM battery 'isolators'?
I think I might have one, but I'm keen to see what the standard/stock ones look like.

Coley

Re: Explain auxilary battery purpose to me
 

If you're getting a second battery for your winch, I would just run dual batteries in parallel. Get a couple 700CCA EverStarts from Walmart, wire in parallel and spend your bucks on the cable. I run #4 for power and #2 for ground. Configure to use shortest amount of cabling as possible. Your winch motor is more like a starter motor than any other accessory. :chevy:


j

Re: Explain auxilary battery purpose to me
 

In this case, what charging setup changes are required?

Any pictures?

-klb

Re: Explain auxilary battery purpose to me
 

You don't really need any charging changes. Just some wiring finesse. The second battery adds capacity, much needed capacity. I added a 150amp tuff stuff though.

Here's my setup. I wire the alt through a submersible 200amp breaker to the battery pos using #4. I ground the alt to block with a 10 guage, and also ground the alt to the battery with #2. I wire the pos to the winch solenoid with #4. I ground the winch body to the battery with #2 and the small ground as per install instructions back to the solenoid. All the other power wires on the winch running to and fro the solenoid are #4.

I only have one Walmart Everstart 700 CAA, but I am adding a second battery soon, been dragging my feet! I have run the winch a few times with no issues. :chevy:


j

Re: Explain auxilary battery purpose to me
 

One other note. If I had an auxiliary setup, I would wire the winch to the starter battey, and have that battery fed from alt. :chevy:


j

Re: Explain auxilary battery purpose to me
 

the way the factory isolated the batteries was to use a constant duty solenoid,when the vehicle is running, the solenoid allows the spare battery to be charged , when the key is turned off the camper or trailer is drawing power from the spare battery only. for those of you that want to run a winch, you would only run the winch with the vehicle running anyway so not a need to have a second battery

Re: Explain auxilary battery purpose to me
 

From the schematic above the isolator appears to be just a HD relay. Perhaps the same part as a horn relay.

Re: Explain auxilary battery purpose to me
 

This is a thread on my ramp truck aux battery setup. Done the way I like it wired. Newer parts and it works great, I can turn the relay on/off from the cab. All the accessaries are relay feed from the contactor by a dash mounted switch also.
The solenoid is a 12v /400amp unit. I use these all the time in the golf cart's I build to run lights and stuff off the carts pack voltage of 36/48 volts.



The thread:
http://67-72chevytrucks.com/vboard/s...d.php?t=780350

My contactor are solenoid which ever you prefer to call it.
:chevy:

http://67-72chevytrucks.com/vboard/a...1&d=1539457083

Re: Explain auxilary battery purpose to me
 

Those contactors appear to be a little pricey ~$75. I guess a horn relay would be too light duty. A Ford starter solenoid work?

I need to set something up for my car trailer battery.

Re: Explain auxilary battery purpose to me
 

My old Warn winch uses 4 ford style solenoids.2 for the forward and 2 for the reverse.They are sized for the load and all ford style are not the same.

And,isolators(for charging batteries) are available aftermarket.I have 1 on each of 2 of my trucks.
One is to charge the batteries on my travel trailer and the other is on my car hauler.They sense the lowest battery and charge that battery only.
A large relay is needed to isolate or switch from one battery to another.
Mike.:chevy:

Re: Explain auxilary battery purpose to me
 

The solid state stuff is more expensive, plus 400amp. I would definitely watch what Andy does, looks like he deals with batteries on the modified golf cart scene. What I was going to add is, I paid a few more bucks and upgraded to solid state for my winch. I hope to never touch it again! :chevy:


j

Re: Explain auxilary battery purpose to me
 

Does anyone have a pic of a stock/factory one mounted in original position?

Coley

Re: Explain auxilary battery purpose to me
 

In my 72 K2500

Re: Explain auxilary battery purpose to me
 

That is an easy fix. Make sure the truck has a fused power lead to the 7 way trailer connector. Then on the trailer make sure there is a lead from the coresponding connector to the battery. Most RVs are wired this way but the trucks tend not to have the power lead. Some trucks are wired up but missing the fuse unless you have the trailering option on newer vehicles.

Re: Explain auxilary battery purpose to me
 

This is how I did my 72. Then on the winch lead I added a set of those quick connects that tow trucks use for there jumper cables. I want to use the winch I just plug it in. No chance of it draining the battery. I also have no issues running a 12k badlands winch (doubled up) for a good amount of time with the truck off. When the winch starts to slow down and strain from the voltage going down I just start the truck. During winching I lock the truck down in low range and first gear and hook a logging chain to the rear hitch and an anchor point. The factory parking brake doesnt do alot for a manual transmission in neutral. It sucks when you are pulling a tree out of the woods and the truck starts to go to it or towards the bank!