Matt,
BTW, your choice of the 75-amp relay was actually a good one and NOT overkill for 2 reasons:
1.. When you start up a DC motor there is something called 'in-rush' current. This current is sometimes 2.5 to 3 times the motor's 'continuously-on' rated current.
2. The relay's contacts will have a longer life when you use a slightly larger relay than the DC Load requires.
Also, I would be careful in selection of the protection devices like the circuit breaker or fuse. These items should be very close to the rating of _wire_ you are using. In other words, makes sure you understand what is current carrying capacity of the wire. Then use circuit protection devices (i.e. breaker) that would allow only 100 to 110% of the capacity of the wire to ever be reached. For 8 gauge wire, that's roughly 40 Amps
Dan K.
Vehicle 1: 1992 Dodge Dakota Club Cab LE Color: Two-tone silver Engine: 5.2L EFI Mods: Home-brew CAI, March pullies, K&N Filters, Relocated IAT, DynoMax Turbo Exhaust and Hi-Flow Cat. Race weight: 3700 lbs.
Photo: http://static.flickr.com/42/84856795_c18903d10f.jpg
Vehicle 2: 1993 Ford Crown Victoria LX Color: White Engine: 4.6L EFI Mods: none yet.
Photo: http://farm4.static.flickr.com/3098/2726734706_3f511ec702.jpg
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