relay will be mounter nearish battery (ie in engine bay)

and yes im taking the feed straight from the battery

incase you're curios as to what i'm upto, this is the wiring for the nitrous pulsoids, if they do not receive a good, clean feed then they do not fire properly. in order to do this i currently have the arming switch mounted in the engine bay! this is obviously no good as i want it in the dash, so i wanna wire them in via relay and have the arming switch on the dash arm the relay.

also the relay on the -ve side is for the throttle switch, normally you just run the switch in-line to the earth (so its a switched earth that fires the pulsoids) but i am using the automatic kickdown switch on the car to arm mine (which works REALLY WELL!) and i do not trust that this can give a clean enough earth (current etc) when wired up directly as a switch, so i want to wire up this switch to ativate another relay (so when the switch goes live it will make the relay activate and earth out properly, completing the circuit and making the pulsoids activate)