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Subject Topic: Cheap way 2 charge leisure batt from car Post Reply Post New Topic
PersonHulltrucker
03/9/2010 at 7:02pm
 Location: Kingston Upon Hull
 Outfit: Mardon Meridian 13-2 1991 View Hulltrucker's Profile View Profile   Reply to Hulltrucker Reply   Quote Hulltrucker Quote  
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I have two leisure batteries and I'm trying to work out a way to charge the one not in use from the car while I am driving about not hitched to the caravan. Someone has suggested a lead that plugs into the cig lighter with croc clips on the other end which i could plug in when im driving and unplug when the engine is switched off (otherwise, I'm told, the leisure battery will try and "equalise" with the car battery) Someone else has suggested a grey plug into the grey socket on the tow bar with croc clips / clamps on the other end connected to the second battery in the boot. The second suggestion seems wiser to me as i guess is means everything then runs through the right relays and fuses  - only problem is I'm not sure I could get that thick grey type wire back into the boot via the hatchback door - some thinner stuff would probably squeeze through but how safe is that? I dont want to spend huge money on relays etc as it's not something I will use that often  - anyone got any ideas?


Personcorpogreen
03/9/2010 at 7:34pm
 Location: nottingham
 Outfit: Grand Canyon 8 Pennine Fiesta View corpogreen's Profile View Profile   Reply to corpogreen Reply   Quote corpogreen Quote  
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Huge amounts on a relay?I think you are looking at the cheapest way to go and the best. It cost me £25 to have mine fitted. The relay was fitted near the alternator, and a wire taken to the rear seat .I did the rest. Fitting a battery box under the backseat of a BMW next to the cars battery was easy.

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Personmarlot
03/9/2010 at 7:41pm
 Location: None Entered
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please don't use crocodile clips. the chance of a spark is too high. use quick release clamps instead.

you also need to find a way of clamping the battery down


PersonHulltrucker
03/9/2010 at 7:48pm
 Location: Kingston Upon Hull
 Outfit: Mardon Meridian 13-2 1991 View Hulltrucker's Profile View Profile   Reply to Hulltrucker Reply   Quote Hulltrucker Quote  
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Point taken about the croc clips - but in principle will either solution actually work?


Personcorpogreen
03/9/2010 at 7:55pm
 Location: nottingham
 Outfit: Grand Canyon 8 Pennine Fiesta View corpogreen's Profile View Profile   Reply to corpogreen Reply   Quote corpogreen Quote  
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Yes you are right marlot. I connect the wires (one from the relay, one from earth) to the battery with the proper clamps and leave a spanner duck taped to the side of the battery box

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PersonHacksaw Bob
03/9/2010 at 8:49pm
 Location: West Midlands
 Outfit: Various tents View Hacksaw Bob's Profile View Profile   Reply to Hacksaw Bob Reply   Quote Hacksaw Bob Quote  
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Assuming you can trace, in the boot, the cable which, with the engine running, feeds the appropriate terminal on the grey socket (ie the one that would charge the caravan battery), could you not use a tap connector to run a fused cable to the battery?

This would avoid wiring up a grey plug, feeding cables through the boot/hatch and having to remember to uplug a lighter socket lead.

As recommended above, use either car type or quick release connectors on the terminals of the securely mounted battery.


PersonCandP
03/9/2010 at 8:54pm
 Location: North West
 Outfit: Elddis Avante 554 View CandP's Profile View Profile   Reply to CandP Reply   Quote CandP Quote  
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Those tap connectors should be made illegal in my opinion!

A perfect way to create a hot splice and a fire.


Personmacaw
03/9/2010 at 9:15pm
 Location: south west
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Hi there
if you know what you're doing wire in one of these.
One I would use


Cheaper version

regards macaw


Personjanus
03/9/2010 at 11:40pm
 Location: Rochdale
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Quote: Originally posted by Hulltrucker on 03/9/2010
  The second suggestion seems wiser to me as i guess is means everything then runs through the right relays and fuses  - only problem is I'm not sure I could get that thick grey type wire back into the boot via the hatchback door - some thinner stuff would probably squeeze through but how safe is that? I dont want to spend huge money on relays etc as it's not something I will use that often  - anyone got any ideas?

Don't use croc clips get some quick release connectors and a length of 15 amp two core cable, irt works and it is very safe. When you connect it up use the connections which are designed to power the fridge as they come from the S socket ( pins 6 and 7, 7 being the earth  ) as this is the only circuit on a correctly set up modern ( post 1997 ) setup which is live when the engine is running and has zero voltage when the engine is not running. I have used this system for years and it is simple and very very effective.

 



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Bill

For a licence dated 1997 or later you must add together the plated max weight of the caravan and trailer, if the total is 3500 or less you can tow it. You may even tow a caravan with a MAM greater than the cars unladen mass the restriction was removed in 2013

Mondeo Titanium 140 tdci


Personmarlot
04/9/2010 at 7:29am
 Location: None Entered
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>> Point taken about the croc clips - but in principle will either solution actually work?

The best one is coming from the 12S socket. You already have the relay and such like, so won't run the risk of flattening the car battery.

if it were me, I'd solder a wire into the feed to the 12S socket, feed it into the boot through a big fuse (say 20A) and terminate in a 50A anderson plug. An auto electrician would probably charge £20 for doing the wiring.

http://cgi.ebay.com/ebaymotors/Anderson-Style-Quick-Connect-Plug-50A-Gray-6AWG-_W0QQcmdZViewItemQQhashZitem45f47b7080QQitemZ300454473856QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear


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PersonHulltrucker
04/9/2010 at 2:48pm
 Location: Kingston Upon Hull
 Outfit: Mardon Meridian 13-2 1991 View Hulltrucker's Profile View Profile   Reply to Hulltrucker Reply   Quote Hulltrucker Quote  
Joined: 20/9/2007

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Just to say many thanks to you all that posted replies - I think I have it clear in my head now what I need to do and I will defdinately NOT use croc clips!

 

Thanks again



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