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Old 05-21-2014, 04:16 AM   #1
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Default Well, I done a dumb thing....

I parked my '01 Roadtrek in the garage last fall after winterizing it. I've been pretty good about going out and running the generator for an hour once a month or so-seemed to keep the coach battery topped right up. Now...I was under the impression that the chassis was connected to the coach system by a diode or regulator, such that the chassis alternator would charge the coach when the chassis battery was charged (which seems to work), and isolate the chassis battery from discharge from the coach system. I also thought the coach generator would charge the chassis battery when it was running.

It appears that I was wrong. Stuck the key in the ignition and stone-cold dead battery. I'm charging it now, and was able to get the rig to start. Took it for a ride then parked it-I'll see if it's holding charge in a few hours.

So, am I incorrect in thinking that the gen would ever charge the chassis battery? Or is there a switch somewhere I need to engage to do so? Not really a big deal as long as I know-if I'd had a clue I'd have thrown a battery tender on when I parked it. I thought I had read through the forums and had a clue, but obviously not.

Could be worse-battery has an '09 sticker, so was about due for replacement anyway. But with use of a tender over the winter I've had them last a long time.

Thanks.
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Old 05-21-2014, 12:41 PM   #2
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Default Re: Well, I done a dumb thing....

Older Roadtreks have an isolator and it does not allow for charging the chassis battery when plugged in or running the generator.
I don't know what year RT started installing battery separators that allow for allow for charging the chassis battery when plugged in or running the generator. The '04 I had an isolator not a separator.

You have a few options:
- jump the isolator terminals (not recommended as too easy to forget to remove)
- a battery tender like you mentioned - I used one that plugged into the 12v accessory outlet on the dash
- install a switch
- upgrade to a battery separator
- run the van engine

and maybe others........
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Old 05-21-2014, 01:07 PM   #3
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Default Re: Well, I done a dumb thing....

I had a bad diode in my '02 isolator which would allow the coach systems to draw down the chassis battery, if/when the coach batteries were enabled. If that wasn't your case, then read no further.

They were made for Roadtrek by an outfit called Hehr Powerline, and I picked up a replacement when we were in the DFW, TX area a few years back. If your isolator is placed such that you can get a multi-meter on the terminals easily there was an isolator test procedure on their website somewhere, or I may have put a copy of it on here somewhere. If you suspect your isolator my be faulty. Hehr "contact us" support were pretty good at responding to email queries, as I recall, if you have any questions.

Otherwise, Marko's and your suggestions for preserving charge status for your chassis battery when not in regular use, are probably your best options. You might also consider switching your chassis battery from a typical starting type, to a deep cycle type, in the event that it runs down again between recharge cycles. They tend to be more durable in those situations, and may survive more discharge cycles than a starting battery.
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Old 05-21-2014, 01:31 PM   #4
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Default Re: Well, I done a dumb thing....

Install one of these

http://www.lslproducts.net/TLSPage.html

This will charge your chassis battery from your coach battery.
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Old 05-21-2014, 02:11 PM   #5
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Default Re: Well, I done a dumb thing....

Both of my Bs, the Pleasure-way and Great West Van never charged the chassis battery from being plugged into shore power for the auxiliary battery. I assumed that was the normal setup. Periodic starting during the cold Minnesota winters was all that was needed in my experience.
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Old 05-21-2014, 07:58 PM   #6
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Default Re: Well, I done a dumb thing....

You can use the Battery Tender Jr. to keep the chassis battery charged when the coach is plugged into shore power. You can purchase the longer cord, and case from the "accessories" link. Just plug it into a live ac outlet in the coach, and plug the 12 volt end into the cigarette lighter, or accessory receptacle. You may find it cheaper at Amazon, etc.
I also use it (as a trickle charger) on our cars to keep the batteries charged, and healthy when they are going to sit for awhile.
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Old 05-21-2014, 09:47 PM   #7
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Default Re: Well, I done a dumb thing....

That would work.
Not a bad idea, either, if you're plugged in during shore leave.
Or, get a remote starter/alarm installed, and just start the van every once in a while from the comfort of your living room.
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Old 05-22-2014, 05:43 AM   #8
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Default Re: Well, I done a dumb thing....

Thanks for the info. I have 2-3 Battery Tender Jrs sitting around or on ATVs and bikes. I could have plugged it in any time. Looks like I dodged a bullet though-it started up after sitting (off charger) overnight. I'll plug it in on 2A charge and leave it a few more hours. I'm bringing the charger along this weekend! Rather than jumpering the "isolate" terminals as mentioned, I'll put a switch there. It can stay "on" over the winter, that way the gen should keep both bats charged, then flip it off during the camping season. (or hope I remember to!). So...just where are these "isolate terminals" located?
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Old 05-22-2014, 12:18 PM   #9
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Default Re: Well, I done a dumb thing....

Quote:
Originally Posted by IdahoRenegade
So...just where are these "isolate terminals" located?
On the isolator. On my 2002 it's mounted on a frame cross member under the front of the van, so that was why I suggested testing it, if it's easy to get at. Mine isn't. It will be the size of a small brick and have heat sink on it, as well as 3-4 threaded posts (terminals) with wires and nuts on them. It might also be located in the engine compartment somewhere, which makes it a lot easier to get at, and makes more sense to me, except when it's hot out. It may be red or blue in color. If it's the OEM Roadtrek isolator from back then, it's probably red. After market models (like the replacement I got directly from Hehr Powerline) might be blue, or just about anything. Before and after.....

Attached Images
File Type: jpg RTisolatorpics 042smaller.JPG (187.4 KB, 578 views)
File Type: jpg RTisolatorpics 007smaller.jpg (65.6 KB, 578 views)
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Old 05-22-2014, 01:58 PM   #10
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Default Re: Well, I done a dumb thing....

Mike,
What is the red stuff you sprayed over the terminals?
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