I'm just working out the wiring to install UK heated seats and headlight adjusters into my J-Spec. I've pretty much worked out the pin-outs for the switches and where i'm going to draw the internal light power and earths from, but could do with some advice on how best to source the main power and earth for both systems.
I'm looking at the Cig Lighter as the most obvious source. It's rated at 15A and this is what the heated seats would have required too. My concern is that i'm also drawing the power for the headlight adjuster motors from it too, as well as whatever may be plugged into the Cig Lighter port, so I have a few questions:
1 - Although both these are unlikely to be on often, or at the same time, what sort of loads will they draw if they are both on together, as well as something else plugged into the Cig Lighter and can the Cig Lighter take it?
2 - Is there a better way of spreading the power draw across other sources in the car's loom?
3 - Does it matter where I earth them, as to avoid hacking into the loom too much I'd prefer to run a local earth to the vehicle body at each switch if possible. Would this cause any problems?