Switch positions (1 Viewer)

[Tony Ryan]

hi all could someone please explain what position to put the three way switch in aux middle vehicle when hooked up to mains .when your driving and when you're parked thanks in anticipation

 

[pappajohn]

Mid position is usually off....not charging or using either battery and just running everything off the charger/power supply.
Set in mid then turn on some lights.
Press one end of switch and closely watch the lights....do light become slightly brighter ?
If so that is the hab battery charge position.
Even easier if you have a volt meter across the hab battery.
If off grid you need to know which is which or you could flatten the starter battery by mistake.

 

[MC 55 FUN]

On ours, and some other MH's . . AUX is selected for the leisure battery / EHU to supply power, VEH is selected for the engine starter battery to supply power ( sparingly, if ever ) & the middle position is off - no supply from either the leisure battery or EHU or the engine starter battery.

This example, no doubt , doesn't apply to all MH's.

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[SomeoneElse]

Another bit of advice is that the switch does switch the full current they usually only switch a small current that switches one of two relays. Now relays don't use much power but they can still flatten a battery if left on for a couple of months. Therefore get in the habit of leaving it in the off position when the MH is left unused. A multi-meter is good value and when used regularly you will soon get to know when either of the batteries require recharging.

 

[Tony Ryan]

Thanks for your replies but I still don't know what position it should be in when hooked up to mains and whilst driving

 

[TheBig1]

whilst driving on leisure battery and on mains, one day in 4 on cab battery, the other 3 on leisure. when parked up and not in use and not on hook up, then in centre position

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[pappajohn]

When driving the switch position is irrelevant, it will be charged by the alternator regardless.

On hook up you need to identify which battery you want charging...hab or cab....and set the switch to that battery.....you really need a volt meter to check properly.
On hook up and switch center neither battery is charged or used....Only the charger will supply your 12v circuits.

See my previous post.

 

[Tony Ryan]

Thanks guys it makes sense to me now

 

[Techno]

Always helps people to help you if you supply pictures. This is so easy to do direct from your smart phone on this forum.
Just select upload a file and the option from camera while using it as the browser.

Also the make of control panel and vehicle etc

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[GJH]

We had such a switch in our Autoquest 100. The following text is taken from the Elddis manual.

Aux/Veh
When the switch is in the ‘Veh’ position the motorhome 12-volt system is powered from the vehicle battery. When it is in the ‘Aux’ position it is powered from the motorhome’s auxiliary battery or the 12-volt charger/power supply if the motorhome is connected to a 230-volt supply.
It is recommended that the motorhome be used in the ‘Veh’ position sparingly as prolonged use without running the engine can flatten the vehicle battery.

We inadvertently switched over to Veh one night when we hadn't had the van long and needed to get a jump start the next morning as a result

 

[Tony Ryan]

Thanks for that very helpful