19-08-14, 04:14 PM
A quick Google explains it 
It's not too hard, you can pick up automotive relays from halfords for a few quid.
Worst case run it directly off your side light live feed, accessories are fairly low voltage do should be ok, but there's always a risk if you put a lot of juice through it.
A relay is the safest way to isolate it on its own circuit.
Just Google 'how to wire a car relay' and it explains it.
Four connections, earth, live from battery, live from side light and connection to the accessory.
It's not too hard, you can pick up automotive relays from halfords for a few quid.
Worst case run it directly off your side light live feed, accessories are fairly low voltage do should be ok, but there's always a risk if you put a lot of juice through it.
A relay is the safest way to isolate it on its own circuit.
Just Google 'how to wire a car relay' and it explains it.
Four connections, earth, live from battery, live from side light and connection to the accessory.