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Doug, I'm guessing the mad electric wire kit comes with the less expensive relay. I've used some of the cheapest relays ever and never had an issue with the relays. I ALWAYS carried a spare.

I generally wire it like the first diagram and use two relays. One for the starter and wired like the diagram. The second I remove the alt wire from the starter relay in the first diagram and run it like the 3rd diagram with the s605.

Once the car starts, the only two hot wires to the front run to the starter relay lug and the alternator wire.

The starter wire/cable is only hot when the key is in the start position.

Hope that helps. It's a bit of a hybrid of the two as I don't like any of the three on a standalone basis. My thinking is that once you throw the cut off, everything beyond the switch and relays should be dead. Keep anything hot contained to a small area in the trunk.

Revised the way I like to wire them up.

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Rob,,,,
Is there an advantage to running TWO relays,,,,
Wouldnt the pic below be OK ?
Sorry,,,i am learning here,,,,
Seems like the same thing ??
(ps,,in your pic,,you have 2 "different" relays,,one a "ford" the other a sBorg ? (is there a difference,,),,again forgive my electrical knowledge,,