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steve50 Profile
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Date Registered: 05-2011
Location: Hillcrest Vic.
TOTAL POSTS: 118
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Rear aux plug.


Hi all, would the rear aux plug wiring handle a caravan fridge with the wiring tapped into the wiring behind the cigarette plug and through a Anderson plug into the caravan or would that fry the wire.
Cheers Steve.

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Steve&Raelene
member no X-1952(c)
2008 t31xtrail
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BPxtrail Profile
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Date Registered: 08-2013
Location: Canberra
TOTAL POSTS: 119
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Re: Rear aux plug.


G'day Steve,

Fuse no.19 (15Amp) under the steering wheel, supplies power to BOTH the front and rear power sockets, so you'll need to look at the fridge's manufacturers sticker to see how much current the caravan fridge draws. Note that you'll have to take into account the fact that both sockets are fed from the one fuse, so you'll need to allow for any device plugged into the front.

If the manufacturer doesn't give you the current draw but says something like "Only draws 50 Watts" then you use the formula;
Current (Amps) = power (Watts), divided by voltage (V).
So in our demo case, C = 50/12, which equals 4.166 Amps.
If you know the Amperage (C) of a device and want to work out how much power (Watts) a device is using simply use P = V x C.

In electrical engineering there's a rule-of-thumb which says devices plugged into a wire should be rated at no more than the two-thirds of the fuse which controls that wire, so in this case, to be on the safe side, you wouldn't use these sockets with any more than a 10 Amp rated device.

Hope this helps.






Last edited by BPxtrail, 13/May/2017, 5:04 pm


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2013 ST, T31 Series 5. Aug, 2013
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steve50 Profile
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Date Registered: 05-2011
Location: Hillcrest Vic.
TOTAL POSTS: 118
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Re: Rear aux plug.


Thanks for that BP,I am already running 2 charges and a dash cam of the front socket so I think I will go with my first thought and run a whole new wire from the battery and put in a fridge switch so I don't flatten the battery when the car is not going.
Cheers steve.

---
Steve&Raelene
member no X-1952(c)
2008 t31xtrail
auto
silver
nudge bar/Navara driving lights
LPG
bash plate
uniden CB
Alloys Geolanders A/T-S
Reverse camera
13/May/2017, 7:53 pm Link to this post Send Email PM   Send Private Message Blog
 
BPxtrail Profile
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Date Registered: 08-2013
Location: Canberra
TOTAL POSTS: 119
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Re: Rear aux plug.


Got to agree with you Steve, running a cable from the battery to the fridge would be the best solution in terms of reliability and security, but may I suggest that you do it via a 20A relay and an in-line fuse.
Mount the relay next to the battery and power-it-ON via your ignition. This way you can't flatten the battery. :-)
If you like you could run the switch lead into the cabin and fit a rocker or toggle switch somewhere convenient, so the fridge can be turned off when not required.
If you're not confident in doing electrical work yourself I'd go to an auto leccy and let him do it. Reckon I could do it in around an hour so shouldn't cost much.

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2013 ST, T31 Series 5. Aug, 2013
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Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5785
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Re: Rear aux plug.


With the length of wiring from the battery, to the rear anderson plug, to the caravan you will need to run wires bigger than what would be rated at 20A so that you do not get a large voltage drop.
Also make sure you run both a +ve and -ve because you shouldn't rely on the body earth connections for higher power devices because a poor earth connection can have the same voltage effect.

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Kev X450(c) T30 Guru
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steve50 Profile
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Date Registered: 05-2011
Location: Hillcrest Vic.
TOTAL POSTS: 118
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Re: Rear aux plug.


Thanks guys for the feedback, I was looking at using a fridge switch that switches the power of to the fridge when it detects power drops ie when the car is turned of and using 4mm or 6mm wire from the battery to the fridge.
Having slept on the answer I think a relay maybe an easier and cheaper option. Where would be the best place to get connect the ignition on wire to and should it be the same thickness as the other wires to the fridge?
Thanks again
Steve.

Last edited by steve50, 21/May/2017, 10:40 am


---
Steve&Raelene
member no X-1952(c)
2008 t31xtrail
auto
silver
nudge bar/Navara driving lights
LPG
bash plate
uniden CB
Alloys Geolanders A/T-S
Reverse camera
20/May/2017, 7:27 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5785
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Re: Rear aux plug.


Hi Steve,

Relays draw a low current so the wiring from the ignition to the coil does not need to be as large as the main power wiring.

The easiest place to pick up an ignition signal is to find what items are only active with the ignition on instead of the accessories and splice into that wire. I think the auxiliary 12V power sockets do (not the cig lighter socket).

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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CaptK Profile
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Date Registered: 03-2017
Location: Sydney, Northern Beaches
TOTAL POSTS: 63
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Re:


I just finished running a 6mm cable to the rear in mine for a fridge. (Engel 40L)
It's the same size I ran in my Pajero with no issues at all.

The fridge only draws 2.6A maximum, so 6mm is more than adequate

I was surprised just how easy it is to run the cable in a secure and out of the way location in the X-Trail - 10 mins and it was done ... Pajero was a 90 min job due to PITA rear trim panels

Last edited by CaptK, 21/May/2017, 4:07 pm


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