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If your antenna draws more than 5A the relay rated for that will still work BUT here is what will happen:
Every time you break the circuit (by switching the relay) an arc will occur. Over a period of time it will burn the contacts until it either won't make connection again, or it will weld shut and won't break connection. Murphy likes to make sure that happens when it is least convenient to you. The fuse won't prevent this from happening. I suggest you check the current draw on the motor at the voltage you will be using and get a relay that has a rating that is 20-50% higher at least.
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2002 T-Bird, Via SP13000, Travla C158, M1-ATX, 1GB RAM, 120GB 2.5" drive, SlimSlot DVD-RW, XP, RR, Winamp, Xenarc 700TSV, HTC Touch PPC/Phone, BU-353 GPS/iG3, Elmscan OBDII, Griffin PowerMate, 2 Blaupunkt amps, Polk spkrs, 5 sec startup/S3 STR
~Jimmy
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