trying to wire spst 30/40 5 wire relay

That's the same as the Veleman 111 kit. Used to remove the second pot to emulate a 508d I'm sure I'm, missing something here but it has a built in relay.

NC is left alone. (Unless you want something connected when the relay is off.) A fuse should be placed at the start of the wiring to protect it - ie, at the battery. That might be a 10A fuse - ie, to handle 7.5 working Amps plus the draw of the timer & relay +ie, 80ma + 250mA = 330mA ~8A. The motor might have an inrush current current that may exceed 8A or 10A. That may require a slow-blow fuse. Try it and see. You might decide to run 3 fuses - eh, a plenty-big 20A at the battery (to match or protect its wire), a 100-250mA for the timer, and whatever for the motor. If the motor uses 7.5A, you would NOT use a 7.5A fuse. Normally fuses would be sized to run at ~70% capacity, hence you'd probably want a 10A fuse. The question is, what size fuse is needed to protect the motor - ie, what value of over-current will fry it? (But that is probably something that required a boosted voltage.....)

Exactly word for word what I would have said Peter except this has gone on too long it's only a bloody relay. P.S. My rules state fuse to be securely mounted no more than 10cm (4") from power source e.g. battery.