Tow vehicle battery isolator - Page 3 - Fiberglass RV


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Old 06-13-2013, 10:00 PM   #29
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Funny that no one has the charge line on an accessory circuit from their tug. But then I have the opposite problem - if I don't unplug the trailer at night the car runs the coach battery down.

For the person who mentioned starter solenoid, you need a pull and hold (is that what you call it?). It has one coil to close the contacts and a smaller coil to hold them closed. I think Ford trucks used it for their starters?

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Old 06-13-2013, 10:16 PM   #30
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Originally Posted by Thomas G. View Post
I know! I know!

If you had no fuse or circuit breaker, you could short out the connecting wire and burn up the tow vehcile, camper or both.
Gee Tom that sure Sounds like fear mongering to me ;-)
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Old 06-13-2013, 11:36 PM   #31
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... why wouldn't one just put an on/off switch in between the TV battery and the camper.
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... instead of an isolator a motorhome or truck camper could use a cheaper, simpler, and more reliable manual switch - which would accomplish the same thing as unplugging a trailer cable ...
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I may have called it the wrong thing.
Mike and I are talking about the same thing - and I think his description is perfectly clear - applied in different situations.
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Old 06-13-2013, 11:49 PM   #32
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Funny that no one has the charge line on an accessory circuit from their tug.
Several members of the SiennaChat forum have used an accessory circuit to control the relay for their trailer charge circuits... typically because they are locating the relay somewhere in the rear where it is available and ignition-switched power is not. It seems like a reasonable approach to me.

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For the person who mentioned starter solenoid, you need a pull and hold (is that what you call it?). It has one coil to close the contacts and a smaller coil to hold them closed. I think Ford trucks used it for their starters?
This may address the problem with common starter solenoids (they can't handle continuous use), but I don't think anything this obscure is required. The charge line only needs to handle one tenth of the current of a starter, and suitable continuous-duty relays are cheap and readily available.
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Old 06-14-2013, 08:02 AM   #33
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Why would one put anything between the TV battery and the trailer???
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Fuse or no fuse is irrelevant to the need for an some sort of isolator. .......
Well, Byron, you did say anything.
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Old 06-14-2013, 08:26 AM   #34
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When I wired my 7-pin for 12V dc power from the car battery, I simply used a solenoid that was activated when the ignition was switched on, with power coming directly from the car battery through a fuse and the solenoid, to the 7-pin. When the tug is stopped and ignition is off, there is no power from the tug to the trailer, and no chances of running down the battery on the tug. Very simple to install and works great.
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Old 06-14-2013, 08:33 AM   #35
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....... Very simple to install and works great.
Oh sure, make it sound simple. To some, it is just another potential failure mode.
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Old 06-14-2013, 08:40 AM   #36
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Oh sure, make it sound simple. To some, it is just another potential failure mode.
Life is too short to spend every waking moment worrying about what could go wrong. If we had to stop and ponder every possible failure mode for everything we do, we would never get out of our driveway. I would rather be camping.
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Old 06-14-2013, 06:50 PM   #37
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All of the accessories in my car are run off a relay. The ignition switch just triggers a relay and that actually carries the load. Funny thing is there is more failure of the switch, which hardly does any work, than there is of the relay that does the heavy lifting. They even were so kind to have a big lug on the bottom of the relay panel for adding accessories to the car.

Reliability of any gizmo you put between the tug battery and the coach battery is mostly related to quality of workmanship and materials. Skimp on either and you will have failures sooner than later. And the problem is most people are more worried about the bottom dollar than quality so most of what you get in the parts store is Chinese crap.

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