mattL1983

I have wired an AC live feed from my radio to the live feed in pin 3 of my STI spray switch. The live feed out pin 5 on the switch then goes to the live feed in on a normal four pin relay.

I then have an earth on the relay. As well as another live feed in to the relay from AC of the radio, combined with a live feed out to the spray pump, which has a seperate earth.

But when I press the switch on the radio fuse always blows. I understand its this fuse as I'm using power from the radio, but can't work out why the fuse always blows.

I have used the below wiring diagram for the relay and am quite sure I've got the rights pins 3 & 5 for live in and out on the switch.

Relays, Single Pole Double Throw (SPDT), Automotive Relays

any help much appreciated.