Originally Posted by Spyphish
Do I grab 12v at the starter relay on firewall near brake booster (which has a fusible link) or just come direct from battery with an inline fuse. Or is a fuse required? Now to figure out the diagram of a relay. Thanks


Where the following link shows "switch in dash" substitute switched 12v

https://itstillruns.com/wire-automotive-relay-4912752.html

You can tie in to the starter relay connection that is probably a cleaner setup, always use a fuse, fusible link or circuit breaker.