BPxtrail
X-TRAIL ENTHUSIAST
Date Registered: 08-2013
Location: Canberra
TOTAL POSTS: 126
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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
--- 2013 ST, T31 Series 5. Aug, 2013
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13/May/2017, 4:22 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6112
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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.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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14/May/2017, 7:58 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6112
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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).
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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21/May/2017, 12:29 pm
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