where do these normally fit?
are they bolted to the body? so the heatshink is earthed by bolting to the chassis?

reason i ask is in the wiring diagrams it says your supposed to connect an earth lead out of the ign amp onto the heatsink then to the engine
i want to know if i can bolt the heatsink down to the chassis, earthing it or if i need to insulate it from the chassis 1st

cheers peeps.