Same as if it's fitted to the vehicle.
- to the housing/body.
+ to the main positive terminal on the solenoid.
You will also need to supply a + to the smaller terminal on the solenoid.
Or you could take it to your local Auto Electrician to test.
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Couple of hits to the starter and the missus cranking and boom she started. Changing it on the weekend. Do they have a gasket or can I use hi temp silastic