12 Volt System Fuse boxes

Kevmac,
the fuse size is there to protect the wiring and not the appliance so if the wiring is 2.5 sq/mm you would use a 15a fuse, 1.5 sq/mm 10 amp fuse.

If you can get a hold of a DC tong tester you can check your max load on a circuit and put a fuse in that is say a couple of amps above that load, that is as long as you don't exceed the current carrying capacity of the cable.

I would think that most of your 12volt wiring would be 10 amp cable except for your fridge which maybe 15/20 amp cable if it originally had a 3 way fridge installed.

Have a good one
RA.

G'day kevmac, if you go to a marine accessory outlet (whitworth's mailing catologue) they have a panel of rocker switches 6 or 8 with individual glass fuses fitted - you can adjust amperage fuses to suit accessory, just have to re name (dymo) pre printed accessory label,
hoo roo

Hi Kevmac,

ABR Sidewinder, a Business Member of ExplorOz has gear to suit you.

The 12 Volt Shop in WA also has a comprehensive range of fuses etc.

Either estimate or measure the current draw for each circuit and use a fuse next standard size above. eg: for a 6A draw use a 10A fuse.

Kevmac
From another ex PMG/Telecom/Telstra tech I've found that most of the problems in vehicle wiring relate to poor negative ground connection and fuse contacts.
When I wired up the Humvee and now the Oka I used that figure eight cable that has a black sheath Cable in a size suitable for the current draw and then there are no problems with ground connections.
For fuse boxes I use these ones Fuse box which have ground/neg connections as well so all wiring is neat and tidy.
Yes it is a bit expensive to set up but in the long run well worth the effort and cost.
Make sure you remove and clean the spades on the fuses regularly as those alloy spades oxidise and lead to HR joints, which leads to heat which etc etc.
Fridges especially seem to have more probs than most.

Thx to all of you for your quick responses and help............have a fair idea now !

So is this what all us "aged" ex PMG guys do is it - re-wire our RV's. I guess it is "in our blood".

Good to see a few people remember what the PMG is - they were the days.

I remember well the 50V battery banks in the bowels of exchanges amongst all the lead covered cables ..... and the paper insulated wires.

Now there is a lost skill - the guys that did the "lead wiping" on the cable joints.

I am showing my age .....

Ken