Split charge and second battery.

Hi all,
As you can see, 3 posts in one weekend...it's been a busy one for me!
Anyway, going camping and I need to charge a second battery. I have bought a
'W4 Combi Master' fridge power supply relay and charging relay...and a
second battery!
The instructions are a little confusing as they only tell you how to wire it
up to a12S socket.
I can get a cable from the relay to a live ignition feed, a cable to an
earth and a fused cable to battery positive or starter solenoid live feed. I
am confused as the instructions go on to talk about connecting red and blue
leads from the grey 12S cable to the relay.
Is it safe if I just don't connect these 12S leads?
The relay has the following connections, and I'll try to explain where the
wires should be connected...
H/DUTY 12V - Fused Battery Positive or Starter Solenoid feed.
Earth - Earth (I'm sure about this one!).
12V Ign. - A lead that is only live when the ignition is on.
Fridge 12S Red - I don't have this.
Batt. Tr. 12S Blue - I don't have this either.
Batt. Chg. - Does this go to the Positive on the second battery?

Any information will be much appreciated. Thanks in advance.
Wolverine.
Big Red 110 CSW

"Wolverine" <[email protected]> wrote in message
news:[email protected]...
> Hi all,
> As you can see, 3 posts in one weekend...it's been a busy one for me!
> Anyway, going camping and I need to charge a second battery. I have bought
> a 'W4 Combi Master' fridge power supply relay and charging relay...and a
> second battery!
> The instructions are a little confusing as they only tell you how to wire
> it up to a12S socket.
> I can get a cable from the relay to a live ignition feed, a cable to an
> earth and a fused cable to battery positive or starter solenoid live feed.
> I am confused as the instructions go on to talk about connecting red and
> blue leads from the grey 12S cable to the relay.
> Is it safe if I just don't connect these 12S leads?
> The relay has the following connections, and I'll try to explain where
> the wires should be connected...
> H/DUTY 12V - Fused Battery Positive or Starter Solenoid feed.
> Earth - Earth (I'm sure about this one!).
> 12V Ign. - A lead that is only live when the ignition is on.
> Fridge 12S Red - I don't have this.
> Batt. Tr. 12S Blue - I don't have this either.
> Batt. Chg. - Does this go to the Positive on the second battery?
>
> Any information will be much appreciated. Thanks in advance.
> Wolverine.
> Big Red 110 CSW
>

From what I can remember wiring up my own 12S socket, there are two wires in
and three wires out. The two in are a permanent live fed through a 20 A fuse
and an earth and the three out were a permanent live Green and two switched
outputs, red for the fridge and blue for batery charging. No other relays
are required as the unit switches the on the blue and red when the vehicle
voltage rises above app13.5V.

Hope this helps

Peter.

I just want to connect a second battery to charge it up. I don't have a
trailer or caravan 12S socket.
So can I just have the fused live feed, earth, and ignition into the relay
(can I forget about the red and the blue from the 12S going into the relay),
and connect a wire from the positive of the second battery to the
'Batt.Charge' on the relay.
A 12S socket should be...
1- Yellow - Reverse lights
2- Blue - Aux.Battery Charge (...or should this go the Positive on second
battery?)
3- White - Earth
4- Green - Constant Live feed
5- Warning Lamp
6- Red - Fridge
7- Black - Fridge Earth

My head is battered!!!
Wolverine
Big Red 110 CSW

"Pete S" <[email protected]> wrote in message
news:[email protected]...
>
> "Wolverine" <[email protected]> wrote in message
> news:[email protected]...
>> Hi all,
>> As you can see, 3 posts in one weekend...it's been a busy one for me!
>> Anyway, going camping and I need to charge a second battery. I have
>> bought a 'W4 Combi Master' fridge power supply relay and charging
>> relay...and a second battery!
>> The instructions are a little confusing as they only tell you how to wire
>> it up to a12S socket.
>> I can get a cable from the relay to a live ignition feed, a cable to an
>> earth and a fused cable to battery positive or starter solenoid live
>> feed. I am confused as the instructions go on to talk about connecting
>> red and blue leads from the grey 12S cable to the relay.
>> Is it safe if I just don't connect these 12S leads?
>> The relay has the following connections, and I'll try to explain where
>> the wires should be connected...
>> H/DUTY 12V - Fused Battery Positive or Starter Solenoid feed.
>> Earth - Earth (I'm sure about this one!).
>> 12V Ign. - A lead that is only live when the ignition is on.
>> Fridge 12S Red - I don't have this.
>> Batt. Tr. 12S Blue - I don't have this either.
>> Batt. Chg. - Does this go to the Positive on the second battery?
>>
>> Any information will be much appreciated. Thanks in advance.
>> Wolverine.
>> Big Red 110 CSW
>>
>
> From what I can remember wiring up my own 12S socket, there are two wires
> in and three wires out. The two in are a permanent live fed through a 20 A
> fuse and an earth and the three out were a permanent live Green and two
> switched outputs, red for the fridge and blue for batery charging. No
> other relays are required as the unit switches the on the blue and red
> when the vehicle voltage rises above app13.5V.
>
> Hope this helps
>
> Peter.
>

Snip

> My head is battered!!!
> Wolverine
> Big Red 110 CSW
>

The unit I got from Towshure dont need a feed from the ignition, it senses
battery volts and asumes that the engine is running if the volts are above
13.5 and so automaticaly switches the power to the blue and red wires, if
they fall below 13, it switches the power off to the wires. Suggest you just
connect the power feed and earth to the input terminals and the second
battery pos to the blue wire. The second battery neg should be grounded to
the vehicle chassis. This should charge the second battery which can be used
to supply all your goodies etc, and leave the primary battery to feed the
vehicle normal electrics.

Peter.

I have a small second battery but everything running from that has dual
circuit wiring, eg flourescent lights, cigarette lighter socket for
accesories, water pump.

I just use the gizmo I got from a camping shop to isolate it from the main
battery, it has several relays in it so can be used with a caravan battery
via the appropriate socket and all the instructions came with it.

I am intending to get a solar panel to keep it topped up on camp sites as it
is a rather small gel battery originally from an uninteruptable power
supply, but I got it for free so who'se complaining


--
Larry
Series 3 rust and holes



"Pete S" <[email protected]> wrote in message
news:[email protected]...
> Snip
>
> > My head is battered!!!
> > Wolverine
> > Big Red 110 CSW
> >
>
> The unit I got from Towshure dont need a feed from the ignition, it senses
> battery volts and asumes that the engine is running if the volts are above
> 13.5 and so automaticaly switches the power to the blue and red wires, if
> they fall below 13, it switches the power off to the wires. Suggest you
just
> connect the power feed and earth to the input terminals and the second
> battery pos to the blue wire. The second battery neg should be grounded to
> the vehicle chassis. This should charge the second battery which can be
used
> to supply all your goodies etc, and leave the primary battery to feed the
> vehicle normal electrics.
>
> Peter.
>
>

If anyone's interested I found this link to some diagrams for a split
charge/dual battery system...
http://www.manuals.pwp.blueyonder.co.uk/splitcharge.htm

Wolverine
Big Red 110CSW

"Wolverine" <[email protected]> wrote in message
news:[email protected]...
> If anyone's interested I found this link to some diagrams for a split
> charge/dual battery system...
> http://www.manuals.pwp.blueyonder.co.uk/splitcharge.htm

Bloominm eck, yet another copy of the split charge diagram i did for my site
about 6 years ago,

just under the bottom of the picture was a copyright notice i put on it,
should have put it over the middle of the picture instead

that drawing was done based on VW type 2 campers, with a limited size
alternator able to be fitted, hence the 10 amp charge rate was desireable,
and thus the 10 amp fuses shown,

Sigh... i must get round to updating my split charge page on my site, that
drawing's off my earlier site when i had a beach buggy, now got the
kampenwagen, but still using bits off the olf garysbeachbuggy site.