Starter relays?
 

Hi, 52plate WRX trouble starting. Only getting 5.38 volts on starter signal wire. Diagram says it goes through starter interlock relay and interrupt relay. Any ideas where they are so I can test voltage at them. Starting it at mo by running temp signal wire from starter and dobbing it on battery terminal and it starts ok. Bit embarrassing at petrol stations though and missus won't drive it in case she gets a shock doing it. Used to be temporary fault and waiting a min solved it but now it's a permanent fault. Rac man not sure where relays are