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Open Roads Forum  >  Beginning RVing

 > Trickle Charging Chassis battery

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Grit dog

Black Diamond, WA

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Posted: 11/17/19 09:27am Link  |  Quote  |  Print  |  Notify Moderator

If anyone can tell you where to hook up from just that pic, they either have a very similar setup or it’s conjecture.
That’s a battery switch in the middle which seems strange for starting battery (s).
Unless it’s just a cutoff and not a switch between different battery banks.
Better pics needed or learn what goes where before booking up a maintainer.
Are you sure it’s a 12V system?


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Sam Spade

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Posted: 11/17/19 09:54am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:


That’s a battery switch in the middle which seems strange for starting battery (s).


Not strange at all. It is very common to have a "battery switch" and associated control circuitry to charge BOTH banks when either charging input is active......and to break that connection when there is no charging input.
That is the same solenoid that closes when you push the "emergency start" button in the cab.

It is also common for that relay/solenoid to fail, in which case there will be NO cross-charging from either input source......and the emergency start function likely won't work either.

If that has failed, it is important to get it fixed.


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opnspaces

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Posted: 11/17/19 11:09am Link  |  Quote  |  Print  |  Notify Moderator

About the only way I can see you getting a good answer is either trace the cables back to the chassis battery. Or if you have a digital multimeter you could measure the voltage of the house batteries and the voltage of the chassis battery. Then take measurements at the switch and see if you get the same voltages on the posts.


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Land Yachters

Philadelphia

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Posted: 11/17/19 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks all for the input. My chassis and house batteries are on different sides of the coach. I read the info and installation manual for the Trik-L-Start and if I can find the battery solenoid, installing the Trik-L unit seems to be the best idea.


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Bobbo

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Posted: 11/17/19 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

Have someone press and release the button that activates the solenoid while you walk around listening for it to click.


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CA Traveler

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Posted: 11/17/19 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

Also any reason why you can't run a wire across the rig for the Trik-L-Start?


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Posted: 11/18/19 07:26am Link  |  Quote  |  Print  |  Notify Moderator

Voltage drop says that is not the first choice.

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Posted: 11/18/19 08:27am Link  |  Quote  |  Print  |  Notify Moderator

Bobbo wrote:

Voltage drop says that is not the first choice.
Running a longer wire is a reasonable choice however. Any reasonable wire size will be adequate. Trik L Start recommends 16 ga or higher for longer runs. I'd probably use 12 ga.

It's a battery maintainer at 5A or less and the low current means less voltage drop.

If voltage drop for trickle charging is a concern then Trik L Start with it's internal 0.2V drop is not the right device.

On my last MH I used a 2A 2 stage charger for the chassis battery. The pro was less cost and the con was no chassis charging with solar.

Grit dog

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Posted: 11/18/19 08:29am Link  |  Quote  |  Print  |  Notify Moderator

Battery solenoid? Do you mean starter solenoid? Either way, not sure what it has to Do with hooking up a maintainer to you chassis (start) batteries.
You haven’t answered the pertinent questions yet.
Is it a 12V or 24V system?
Is that switch in your pic just a cutoff switch (looks like it) or a battery combiner?
You’ll hook it up somewhere in that picture and likely where you first suggested or straight to the batteries but understand the system first

Sam Spade

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Posted: 11/18/19 08:44am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Battery solenoid? Do you mean starter solenoid?


No of course not.

Many/most class A and C units have a heavy duty battery relay (solenoid) that connects the two strings together for charging and splits them when not charging.

Asking if it is a 24 volt system is just wasting everybody's time.

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